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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Oct. 25, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	MEDP
Security Exchange Name	NASDAQ
Entity Registrant Name	Medpace Holdings, Inc.
Entity Central Index Key	0001668397
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		36,030,398
Entity File Number	001-37856
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	32-0434904
Entity Address, Address Line One	5375 Medpace Way
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45227
City Area Code	(513)
Local Phone Number	579-9911
Title of 12(b) Security	Common Stock $0.01 par value
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 79,290	$ 23,275
Restricted cash	0	7
Accounts receivable and unbilled, net (includes $1.1 million and $3.8 million with related parties at September 30, 2019 and December 31, 2018, respectively)	140,189	133,449
Prepaid expenses and other current assets	30,918	21,383
Total current assets	250,397	178,114
Property and equipment, net	43,715	52,255
Operating lease right-of-use assets	52,479	0
Goodwill	662,427	660,981
Intangible assets, net	57,345	69,179
Deferred income taxes	293	713
Other assets	5,673	6,691
Total assets	1,072,329	967,933
Current liabilities:
Accounts payable (includes $0.1 million and $0.3 million with related parties at September 30, 2019 and December 31, 2018, respectively)	20,684	16,737
Accrued expenses	102,535	87,493
Advanced billings (includes $1.3 million and $0.4 million with related parties at September 30, 2019 and December 31, 2018, respectively)	169,529	147,935
Other current liabilities	21,644	4,861
Total current liabilities	314,392	257,026
Long-term debt, net, less current portion	0	79,721
Operating lease liabilities	46,022	0
Deemed landlord liability, less current portion	0	24,484
Deferred income tax liability	5,578	439
Other long-term liabilities	14,330	16,560
Total liabilities	380,322	378,230
Commitments and contingencies (see Note 12)
Shareholders’ equity:
Preferred stock - $0.01 par-value; 5,000,000 shares authorized; no shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively; 36,011,725 and 35,665,910 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	360	356
Treasury stock - 200,000 shares at September 30, 2019 and December 31, 2018, respectively	(6,030)	(6,030)
Additional paid-in capital	663,044	639,381
Retained earnings (accumulated deficit)	38,296	(41,487)
Accumulated other comprehensive loss	(3,663)	(2,517)
Total shareholders’ equity	692,007	589,703
Total liabilities and shareholders’ equity	$ 1,072,329	$ 967,933

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, unbilled services with related parties	$ 1.1	$ 3.8
Accounts payable includes related parties	0.1	0.3
Advanced billings with related parties	$ 1.3	$ 0.4
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock shares authorized	5,000,000	5,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock shares authorized	250,000,000	250,000,000
Common stock shares issued	36,011,725	35,665,910
Common stock shares outstanding	36,011,725	35,665,910
Treasury stock shares	200,000	200,000

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue, net (includes $4.6 million and $5.1 million with related parties for the three months ended September 30, 2019 and 2018, respectively, and $13.7 million and $9.2 million with related parties for the nine months ended September 30, 2019 and 2018, respectively)	$ 216,238	$ 179,253	$ 631,083	$ 512,474
Operating expenses:
Direct service costs, excluding depreciation and amortization	81,086	62,520	235,522	184,339
Reimbursed out-of-pocket expenses	70,984	61,476	212,563	173,587
Total direct costs	152,070	123,996	448,085	357,926
Selling, general and administrative	29,120	18,606	73,984	55,112
Depreciation	2,062	2,343	6,035	6,883
Amortization	2,995	7,390	11,834	22,171
Total operating expenses	186,247	152,335	539,938	442,092
Income from operations	29,991	26,918	91,145	70,382
Other expense, net:
Miscellaneous (expense) income, net	(273)	482	(574)	807
Interest expense, net	(253)	(1,941)	(1,956)	(6,558)
Total other expense, net	(526)	(1,459)	(2,530)	(5,751)
Income before income taxes	29,465	25,459	88,615	64,631
Income tax provision	5,488	6,154	17,985	14,207
Net income	$ 23,977	$ 19,305	$ 70,630	$ 50,424
Net income per share attributable to common shareholders:
Basic	$ 0.67	$ 0.54	$ 1.97	$ 1.41
Diluted	$ 0.63	$ 0.52	$ 1.88	$ 1.36
Weighted average common shares outstanding:
Basic	35,939	35,569	35,829	35,525
Diluted	37,835	37,125	37,507	36,795

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Net
Revenue with related parties	$ 4.6	$ 5.1	$ 13.7	$ 9.2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 23,977	$ 19,305	$ 70,630	$ 50,424
Other comprehensive income
Foreign currency translation adjustments, net of taxes	(1,286)	(64)	(1,146)	(1,445)
Comprehensive income	$ 22,691	$ 19,241	$ 69,484	$ 48,979

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Impact to Retained Earnings from adoption \| ASU 2014-09	$ 5,730				$ 5,730
Balance	509,260	$ 355	$ (6,030)	$ 630,341	(114,672)	$ (734)
Balance at Dec. 31, 2017	503,530	355	(6,030)	630,341	(120,402)	(734)
Net income	14,551				14,551
Foreign currency translation	629					629
Stock-based compensation expense	1,467			1,467
Stock options exercised	566			566
Balance at Mar. 31, 2018	526,473	355	(6,030)	632,374	(100,121)	(105)
Balance at Dec. 31, 2017	503,530	355	(6,030)	630,341	(120,402)	(734)
Net income	50,424
Foreign currency translation	(1,445)
Balance at Sep. 30, 2018	564,435	356	(6,030)	636,536	(64,248)	(2,179)
Balance at Mar. 31, 2018	526,473	355	(6,030)	632,374	(100,121)	(105)
Net income	16,568				16,568
Foreign currency translation	(2,010)					(2,010)
Stock-based compensation expense	1,487			1,487
Stock options exercised	609	1		608
Balance at Jun. 30, 2018	543,127	356	(6,030)	634,469	(83,553)	(2,115)
Net income	19,305				19,305
Foreign currency translation	(64)					(64)
Stock-based compensation expense	1,432			1,432
Stock options exercised	635			635
Balance at Sep. 30, 2018	564,435	356	(6,030)	636,536	(64,248)	(2,179)
Impact to Retained Earnings from adoption \| ASU 2016-02	9,153				9,153
Balance	598,856	356	(6,030)	639,381	(32,334)	(2,517)
Balance at Dec. 31, 2018	589,703	356	(6,030)	639,381	(41,487)	(2,517)
Net income	19,198				19,198
Foreign currency translation	(274)					(274)
Stock-based compensation expense	3,183			3,183
Stock options exercised	934	1		933
Balance at Mar. 31, 2019	621,897	357	(6,030)	643,497	(13,136)	(2,791)
Balance at Dec. 31, 2018	589,703	356	(6,030)	639,381	(41,487)	(2,517)
Net income	70,630
Foreign currency translation	(1,146)
Balance at Sep. 30, 2019	692,007	360	(6,030)	663,044	38,296	(3,663)
Balance at Mar. 31, 2019	621,897	357	(6,030)	643,497	(13,136)	(2,791)
Net income	27,455				27,455
Foreign currency translation	414					414
Stock-based compensation expense	5,385			5,385
Stock options exercised	2,904	2		2,902
Balance at Jun. 30, 2019	658,055	359	(6,030)	651,784	14,319	(2,377)
Net income	23,977				23,977
Foreign currency translation	(1,286)					(1,286)
Stock-based compensation expense	9,466			9,466
Stock options exercised	1,795	1		1,794
Balance at Sep. 30, 2019	$ 692,007	$ 360	$ (6,030)	$ 663,044	$ 38,296	$ (3,663)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 70,630	$ 50,424
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,035	6,883
Amortization	11,834	22,171
Stock-based compensation expense	18,034	4,386
Amortization of debt issuance costs and discount	954	471
Noncash lease expense	7,212	0
Deferred income tax provision	2,839	7,260
Amortization and adjustment of deferred credit	(601)	(7,515)
Other	1,768	487
Changes in assets and liabilities:
Accounts receivable and unbilled, net	(5,982)	(12,845)
Prepaid expenses and other current assets	(9,039)	(2,542)
Accounts payable	2,818	(1,323)
Accrued expenses	15,427	21,613
Advanced billings	21,901	28,277
Lease liabilities	(6,477)	0
Other assets and liabilities, net	7,574	(605)
Net cash provided by operating activities	144,927	117,142
CASH FLOWS FROM INVESTING ACTIVITIES:
Property and equipment expenditures	(12,152)	(12,575)
Other	(1,262)	(186)
Net cash used in investing activities	(13,414)	(12,761)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from stock option exercises	5,686	1,810
Payment of debt	(80,438)	(38,156)
Payments on revolving loan	0	(70,000)
Payment of deemed landlord liability	0	(1,387)
Net cash used in financing activities	(74,752)	(107,733)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(753)	(889)
INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	56,008	(4,241)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period	23,282	26,492
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period	$ 79,290	$ 22,251

Basis of Presentation

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

(1) Basis of Presentation

Description of Business

Medpace Holdings, Inc. together with its subsidiaries (“Medpace” or the “Company”), a Delaware corporation, is a global provider of clinical research-based drug and medical device development services. The Company partners with pharmaceutical, biotechnology, and medical device companies in the development and execution of clinical trials. The Company’s drug development services focus on full service Phase I-IV clinical development services and include development plan design, project management, regulatory affairs, clinical monitoring, data management and analysis, pharmacovigilance new drug application submissions, post-marketing clinical support, laboratory services, clinical human pharmacology, imaging services, and electrocardiography reading support for clinical trials.

The Company’s operations are principally based in North America, Europe, and Asia.

Unaudited Interim Financial Information

The interim condensed consolidated financial statements include the accounts of the Company, are prepared in conformity with U.S. generally accepted accounting principles (“GAAP”), and are unaudited. In the opinion of the Company’s management, all adjustments of a normal recurring nature necessary for a fair presentation have been reflected. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but that is not required for interim reporting purposes, has been omitted. The preparation of the interim condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the interim condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results and outcomes could differ from management’s estimates and assumptions. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the Company’s audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

(2) Summary of Significant Accounting Policies

Our significant accounting policies are detailed in Note 3 “Summary of Significant Accounting Policies” of our Annual Report on Form 10-K for the year ended December 31, 2018. Significant changes to our accounting policies as a result of adopting Accounting Standards Codification Topic 842 (“ASC 842”) are discussed below:

Lease Recognition

The Company enters into contracts to lease facilities and equipment to be used in its operations. At contract inception, the Company determines whether a contract contains a lease within the scope of Accounting Standard Codification Topic 842, Leases (“ASC 842”), and determines the appropriate classification of the lease as either operating or finance.

Contracts containing operating leases are recorded on the condensed consolidated balance sheets within Operating lease right-of-use (“ROU”) assets, Other current liabilities, and Operating lease liabilities. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future lease payments over the lease term as of the lease commencement date. In addition operating ROU assets also include lease payments made and exclude lease incentives and initial direct costs incurred. Operating lease expense for lease payments is recognized on a straight-line basis over the lease term within Total direct costs and Selling, general, and administrative expenses. Variable lease costs are primarily related to adjustments for inflation, common area maintenance and property tax and are recognized within Total direct costs and Selling, general and administrative expenses.

Contracts containing finance leases are recognized initially in the same manner as Operating lease ROU assets and liabilities, however are recorded on the condensed consolidated balance sheets within Property and equipment, net, Other current liabilities, and Other long-term liabilities. Finance lease assets are subsequently amortized on a straight line basis over the lease term within Depreciation expense, while the lease liability is accreted within Interest expense, net utilizing the discount rate determined at lease commencement and reduced by periodic lease payments over the lease term. Currently, the Company does not have any finance leases.

The discount rate utilized in determining the present value of future payments for both operating and finance leases, unless implicit in the lease contract, is determined based on the Company’s collateralized incremental borrowing rate based on the information available at lease commencement.

Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option as determined at lease commencement.

Many of our lease agreements have both lease and non-lease components, which the Company has elected to treat as a single lease component for recognition purposes.

The Company may enter into short-term leases (leases with a lease term of less than 1 year), which it has elected not to capitalize as assets and liabilities on the condensed consolidated balance sheets, but instead recognizes lease payments within Total direct costs and Selling, general, and administrative expenses on a straight line basis over the lease term.

Recently Adopted Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09 ‘‘Revenue from Contracts with Customers,’’ (“ASC 606”) to clarify the principles of recognizing revenue and create common revenue recognition guidance between U.S. GAAP and International Financial Reporting Standards. The new standard became effective for the Company in the first quarter 2018.

The cumulative effect adjustment was recorded as a reduction to the opening balance of Accumulated deficit in the condensed consolidated balance sheets in the amount of $5.7 million, with offsetting amounts of $23.9 million to Accounts receivable and unbilled, net, $(1.6) million to Deferred income taxes, $35.1 million to Accrued expenses, $(57.4) million to Pre-funded study costs and $38.9 million to Advanced billings, respectively. The amounts recorded to Accounts receivable and unbilled, net, Deferred income taxes, Accrued expenses, Pre-funded study costs, and Advanced billings reflect differences between revenue recognized and billings to customers by project as well as costs incurred but not settled as of the implementation date. The above disclosed cumulative effect adjustments have been revised from the amounts previously disclosed in the Company’s interim financial statements filed on Form 10-Q for the quarterly periods ended March 31, 2018, June 30, 2018 and September 30, 2018 to correct certain immaterial misstatements to the opening balance sheet adoption impact of the standard. The effects of these misstatements were immaterial to the Company’s results of operations.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASC 842”). The guidance in ASC 842 supersedes the lease recognition requirements in ASC Topic 840, Leases (FAS 13) (“ASC 840”). The objective of ASC 842 is to increase transparency and comparability among organizations by requiring the recognition of Right-of-use assets (“ROU assets”) and Lease liabilities on the balance sheet. In addition, ASC 842 introduces additional disclosure requirements that are meant to enable users of the financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. ASC 842 became effective for the Company in the first quarter 2019.

ASC 842 allows by policy election, an entity to choose its transition approach. Entities must adopt ASC 842 on a either a modified retrospective basis to each prior reporting period presented or through an optional alternative method referred to as the “Comparatives Under ASC 840 Approach” which allows entities to apply the new requirements to only those leases that exist as of January 1, 2019. The Company has elected to adopt ASC 842 utilizing the Comparatives Under ASC 840 Approach. As such, ASC 842 is applied on a prospective basis as of January 1, 2019 and any cumulative catch up adjustment for differences between ASC 842 and ASC 840 were recorded upon adoption.

ASC 842 also allows for the election of certain practical expedients that are meant to ease the burden of transitioning to ASC 842 while still achieving compliance. The Company elected the “package of three” practical expedient allowing the Company to carry forward decisions made and documented under current U.S. GAAP, rather than reassessing all of the Company’s contracts to determine whether they are or contain leases and how they would be classified under ASC 842. The Company has decided not to elect the hindsight practical expedient, which had it been elected, would require the Company to reassess the lease term and assessment of impairment for all of the Company’s leases using the facts and circumstances known up to the adoption date of the standard.

ASC 842 had a material impact on our condensed consolidated balance sheets, as all leases currently classified as operating were recognized as ROU assets and lease liabilities upon adoption. In addition, it was determined that two contracts entered into with a related party for two of the Company’s corporate offices that were classified as deemed assets and deemed liabilities under ASC 840 were determined to be operating leases under ASC 842. These deemed assets and liabilities were reclassified on the condensed consolidated balance sheets to ROU assets and lease liabilities and an adjustment to retained earnings was recorded as a cumulative adjustment for the difference in depreciation expense and operating lease expense as of the date of adoption.

The impact of the adoption of ASC 842 as of January 1, 2019 is as follows:

ASSETS	As of
	January 1, 2019			Adjustments			December 31, 2018
Current assets:
Prepaid expenses and other current assets		21,013			(370	)		21,383
Total current assets		177,744			(370	)		178,114
Property and equipment, net		37,613			(14,642	)		52,255
Operating lease right-of-use assets		51,854			51,854			-
Total assets	$	1,004,775		$	36,842		$	967,933
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Other current liabilities		10,951			6,090			4,861
Total current liabilities		263,116			6,090			257,026
Operating lease liabilities		45,294			45,294			-
Deemed landlord liability, less current portion		-			(24,484	)		24,484
Deferred income tax liability		3,158			2,719			439
Other long-term liabilities		14,630			(1,930	)		16,560
Total liabilities		405,919			27,689			378,230
Shareholders’ equity:
Accumulated deficit		(32,334	)		9,153			(41,487	)
Total shareholders’ equity		598,856			9,153			589,703
Total liabilities and shareholders’ equity	$	1,004,775		$	36,842		$	967,933

In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” ASU 2018-02 allows for an entity to elect to reclassify the income tax effects on items within accumulated other comprehensive income resulting from U.S. tax reform to retained earnings. The guidance is effective for fiscal years beginning after December 15, 2018 with early adoption permitted, including interim periods within those years. The Company adopted this standard in the first quarter of 2019 and it had no impact on the condensed consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, “Intangibles- Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” ASU 2017-04 simplifies how an entity assesses goodwill for impairment by eliminating Step 2 from the goodwill impairment test. As amended, the goodwill impairment test will consist of one step comparing the fair value of a reporting unit with its carrying amount. An entity should recognize a goodwill impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The guidance is effective for fiscal years beginning after December 15, 2019 with early adoption permitted. The Company adopted this standard on a prospective basis in the first quarter of 2019 and it had no impact to the condensed consolidated financial statements.

Net Income Per Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Net Income Per Share

(3) Net Income Per Share

Basic and diluted earnings or loss per share (“EPS”) are computed using the two-class method, which is an earnings allocation that determines EPS for each class of common stock and participating securities according to dividends declared and participation rights in undistributed earnings. Restricted Stock Awards (“RSAs”) are considered participating securities because they are legally issued at the date of grant and holders are entitled to receive non-forfeitable dividends during the vesting term.

The computation of diluted EPS includes additional common shares, such as unvested stock options with exercise prices less than the average market price of the Company’s common stock during the period (“in-the-money options”), which would be considered outstanding under the treasury stock method. The treasury stock method assumes that additional shares would have to be issued in cases where the exercise price of stock options is less than the value of the common stock being acquired because the cash proceeds received from the stock option holder would not be sufficient to acquire that same number of shares. The Company does not compute diluted EPS in cases where the inclusion of such additional shares would be anti-dilutive in effect.

The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2019 and 2018 (in thousands, except for earnings per share):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Weighted-average shares:
Common shares outstanding		35,939		35,569		35,829		35,525
RSAs		98		141		101		144
Total weighted-average shares		36,037		35,710		35,930		35,669
Earnings per common share—Basic
Net income	$	23,977	$	19,305	$	70,630	$	50,424
Less: Undistributed earnings allocated to RSAs		65		76		199		204
Net income available to common shareholders—Basic	$	23,912	$	19,229	$	70,431	$	50,220

Net income per common share—Basic	$	0.67	$	0.54	$	1.97	$	1.41

Basic weighted-average common shares outstanding		35,939		35,569		35,829		35,525
Effect of diluted shares		1,896		1,556		1,678		1,270
Diluted weighted-average shares outstanding		37,835		37,125		37,507		36,795

Net income per common share—Diluted	$	0.63	$	0.52	$	1.88	$	1.36

During the three and nine months ended September 30, 2019, the Company had 245,000 stock options, respectively, that were excluded due to the exercise price exceeding the average fair value of the Company’s common stock during the period. During the three and nine months ended September 30, 2018, the Company had 13,420 stock options, respectively, that were excluded due to the exercise price exceeding the average fair value of the Company’s common stock during the period.

Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

(4) Fair Value Measurements

The Company follows accounting guidance related to fair value measurements that defines fair value, establishes a framework for measuring fair value, and establishes a hierarchy for inputs used in measuring fair value. This hierarchy maximizes the use of “observable” inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. The hierarchy specifies three levels based on the inputs, as follows:

Level 1: Valuations based on quoted prices in active markets for identical assets or liabilities.

Level 2: Valuations based on directly observable inputs or unobservable inputs corroborated by market data.

Level 3: Valuations based on unobservable inputs supported by little or no market activity representing management’s determination of assumptions of how market participants would price the assets or liabilities.

The fair value of financial instruments such as cash and cash equivalents, accounts receivable and unbilled, net, accounts payable, accrued expenses and advanced billings approximate their carrying amounts due to their short term maturities.

The Company does not have any recurring fair value measurements as of September 30, 2019. There were no transfers between Level 1, Level 2 or Level 3 during the three and nine months ended September 30, 2019 or 2018.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Contract Assets and Contract Liabilities

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Contract Assets and Contract Liabilities

(5) Contract Assets and Contract Liabilities

Contract assets and liabilities are reflected in the Company’s condensed consolidated balance sheets within the accounts reflected below.

Contract Assets

Accounts receivable represent amounts due from the Company’s customers who are concentrated primarily in the pharmaceutical, biotechnology, and medical device industries. Unbilled represents revenue recognized to date that has not been billed or is not yet contractually billable to the customer. In general, amounts become billable upon the achievement of negotiated contractual events, in accordance with predetermined payment schedules or when a reimbursable expense has been incurred. Amounts classified to unbilled are those billable to customers within one year from the respective balance sheet date.

Accounts receivable and unbilled, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Accounts receivable	$	113,931		$	85,120
Unbilled receivables		26,987			49,361
Less: allowance for doubtful accounts		(729	)		(1,032	)
Total accounts receivable and unbilled, net	$	140,189		$	133,449

Unbilled receivables decreased from $49.4 million at December 31, 2018 to $27.0 million at September 30, 2019. The decrease is primarily driven by increased customer invoicing.

Contract Liabilities

Advanced billings represents cash received from customers, or billed amounts per an agreed upon payment schedule, in advance of services being performed or revenue being recognized.

Advanced billings consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Advanced billings	$	169,529	$	147,935

Advanced billings increased from $147.9 million at December 31, 2018 to $169.5 million at September 30, 2019. The increase is primarily driven by billing and/or collection activity in advance of revenue being earned for services performed.

On September 30, 2019, we had approximately $1.36 billion of performance obligations remaining to be performed for active projects.

Intangible Assets, Net

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

(6) Intangible Assets, Net

Intangible assets, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Intangible assets:
Finite-lived intangible assets:
Carrying amount:
Backlog	$	72,630		$	72,630
Customer relationships		145,051			145,051
Developed technologies		54,475			54,475
Other		3,074			3,074
Total finite-lived intangible assets		275,230			275,230
Accumulated amortization:
Backlog		(72,630	)		(72,630	)
Customer relationships		(119,478	)		(110,636	)
Developed technologies		(54,475	)		(51,751	)
Other		(2,948	)		(2,680	)
Total accumulated amortization		(249,531	)		(237,697	)
Total finite-lived intangible assets, net		25,699			37,533
Trade name (indefinite-lived)		31,646			31,646
Total intangible assets, net	$	57,345		$	69,179

As of September 30, 2019, estimated amortization expense of the Company’s intangible assets for each of the next five years and thereafter is as follows (in thousands):

	Amortization
Remainder of 2019	$	2,995
2020		7,876
2021		5,114
2022		3,353
2023		2,199
Later years		4,162
	$	25,699

Accrued Expenses

9 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Accrued Expenses

(7) Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Employee compensation and benefits	$	31,458	$	31,344
Project related reimbursable expenses		63,799		51,109
Other		7,278		5,040
Total accrued expenses	$	102,535	$	87,493

Debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Debt

(8) Debt

Debt consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Term loan	$	-	$	80,438
Less unamortized discount		-		(282	)
Less unamortized term loan debt issuance costs		-		(435	)
Long-term debt, net, less current portion	$	-	$	79,721

In the second quarter of 2019, the Company paid off its remaining outstanding obligations against its term loan (the “Senior Secured Term Loan Facility”) under its 2016 Credit Agreement (the “Senior Secured Credit Agreement”). Upon satisfaction of the outstanding obligations of the Senior Secured Term Loan Facility, the Company recorded unamortized term loan issuance fees of $0.3 million to Selling, general and administrative expenses and the unamortized discount of $0.2 million to Interest expense, net.

On September 30, 2019 (the “Closing Date”), the Company obtained a new unsecured credit facility in an aggregate principal amount up to $50.0 million (the “Credit Facility”) through its wholly owned subsidiaries, Medpace, Inc., as borrower (the “Borrower”), and Medpace IntermediateCo, Inc., as guarantor (the “Guarantor”).

On the Closing Date, the Borrower and lender entered into a Loan Agreement (the “Loan Agreement”) providing for the Credit Facility, and the Guarantor executed a Guaranty Agreement providing for its guarantee of the payment and performance of the obligations under the Loan Agreement. The Loan Agreement provides that outstanding balances under the Credit Facility will bear interest at a rate of LIBOR plus 100 basis points (1.00%). The Loan Agreement also provides that the Credit Facility will expire in 364 days from the Closing Date.

The Loan Agreement contains other customary loan terms, representations and warranties, and affirmative and negative covenants, in each case, subject to customary limitations, exceptions and exclusions. The Loan Agreement contains certain events of default, including, among others, non-payment of principal or interest and breach of the covenants.

As of September 30, 2019, there were no outstanding borrowings under the Credit Facility and $0.2 million in letters of credit outstanding related to certain operating lease obligations, which are secured by the Credit Facility.

The Loan Agreement replaces the Company’s Senior Secured Credit Agreement dated as of December 8, 2016 (the “Prior Credit Agreement”), which was terminated on September 30, 2019 (the “Termination Date”). As of September 30, 2019, no amounts were drawn under the Prior Credit Agreement and no fees or penalties were incurred as a result of the termination, other than the payment of accrued commitment fees of $0.1 million through the Termination Date. In addition, on the Termination Date, the Company recorded unamortized loan issuance fees of $0.7 million, consisting of $0.5 million in Selling, general and administrative and $0.2 million of interest expense, during the third quarter of 2019, representing unamortized loan origination fees and loan discounts, respectively, associated with the Prior Credit Agreement.

Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

(9) Leases

The Company enters into leases for real estate and equipment. Real estate leases are for our corporate office space and laboratories around the world. Real estate leases have remaining lease terms of less than 1 year to 20 years. Many of the Company’s leases include options to extend the leases on a month to month basis or for set periods for up to 20 years. Many leases also include options to terminate the leases within 1 year or per other contractual terms.

The components of lease expense as of September 30, 2019 were as follows (in thousands):

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	3,241	$	9,578
Variable lease cost		649		1,995

Supplemental cash flow information for the nine months ended September 30, 2019 related to the leases was as follows (in thousands):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	6,979

Right-of-use assets obtained in exchange for lease obligations:
Operating leases		8,476

Supplemental balance sheet information as of September 30, 2019 related to the leases was as follows (in thousands):

	As of September 30, 2019
Operating lease right-of-use assets	$	52,479

Other current liabilities	$	10,249
Operating lease liabilities		46,022
Total operating lease liabilities	$	56,271

Weighted Average Remaining Lease Term (years)
Operating leases	6.6
Weighted Average Discount Rate
Operating leases		6.1	%

Lease payments due related to lease liabilities as of September 30, 2019 were as follows (in thousands):

	Operating Leases
Remainder of 2019	$	3,151
2020		12,416
2021		12,142
2022		9,644
2023		7,378
Later years		24,411
Total lease payments		69,142
Less: imputed interest		(12,871	)
Total	$	56,271

As of September 30, 2019, we have an additional operating lease related to a corporate office under construction, which has not yet commenced, with future payments of $124.0 million. This operating lease will commence in fiscal year 2020 with an initial lease term of 20 years and a renewal option for two 10-year terms at prevailing market rates.

Comparative period disclosures under ASC 840:

Rental expense under operating leases totaled $2.3 million and $6.9 million for the three and nine months ended September 30, 2018, respectively.

Future minimum rental payments for lease obligations with initial terms in excess of one year as of December 31, 2018 are as follows (in thousands):

			Non-Related		Total
	Related Party		Parties Operating		Operating
	Operating Lease		Leases		Leases
2019	$	1,987	$	6,186	$	8,173
2020		6,843		6,617		13,460
2021		6,964		5,873		12,837
2022		6,757		3,694		10,451
2023		5,229		3,257		8,486
Thereafter		103,870		5,752		109,622
Total minimum lease payments	$	131,650	$	31,379	$	163,029

Minimum annual payments required in conjunction with the Deemed landlord liabilities as of December 31, 2018 are as follows (in thousands):

	Related Party				Total
	Minimum Lease		Less:		Principal
	Payments		Interest		Amounts Due
2019	$	3,918	$	1,818	$	2,100
2020		3,988		1,662		2,326
2021		4,039		1,490		2,549
2022		4,092		1,301		2,791
2023		4,145		1,095		3,050
Thereafter		15,697		1,929		13,768
Total	$	35,879	$	9,295	$	26,584

Shareholder's Equity and Stock-Based Compensation

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Shareholder's Equity and Stock-Based Compensation

(10) Shareholder’s Equity and Stock-Based Compensation

The Company granted 778,986 awards to employees under the 2016 Incentive Award Plan during the nine months ended September 30, 2019, consisting of 10,000 stock option awards and 190,310 restricted stock units (“RSU”) vesting after four years, 5,000 stock option awards vesting after one year, 551,676 fully-vested stock option awards and 22,000 stock option awards with vesting in twelve equal monthly installments beginning on March 31, 2019. The Company granted an additional 38,832 stock option awards, vesting after one year, to non-employee directors under the 2016 Incentive Award Plan, during the nine months ended September 30, 2019.

In the third quarter of 2019, Medpace Investors, LLC (“MPI”), a related party to the Company, filed a Tender Offer Statement (“Tender Offer”) offering to purchase, for cash, vested stock options of employee holders of options outstanding from the 2014 Incentive Award Plan. The Tender Offer resulted in the tender and purchase of 229,431 vested options from employee holders of options by MPI. Under generally accepted accounting guidance governing such transactions, because the Tender Offer was initiated by an economic interest holder in the Company, this transaction is accounted for as a settlement of vested options and a reissuance of options at fair value as of the transaction date. Expense related to the reissuance of options to MPI is included as stock-based compensation expense of $5.1 million within Selling, general and administrative expenses during the three and nine months ended September 30, 2019.

The Company granted 722,200 awards to employees under the 2016 Incentive Award Plan during the nine months ended September 30, 2018, consisting of 443,000 stock option awards and 279,200 RSUs, all vesting after four years. The Company granted an additional 33,801 stock option awards to non-employee directors under the 2016 Incentive Award Plan, during the nine months ended September 30, 2018. These awards will vest on the earlier of (a) the day immediately preceding the date of the first annual meeting following the date of grant and (b) the first anniversary of the date of grant, subject to the non-employee director continuing in service through the applicable vesting date.

Award Activity

The following table sets forth the Company’s stock option activity:

	Nine Months Ended September 30, 2019
				Weighted Average
	Stock Options			Exercise Price
Outstanding - beginning of period		2,945,040		$	24.18
Granted		856,939		$	54.90
Exercised		(345,815	)	$	16.28
Forfeited/Expired		(347,921	)	$	19.29
Outstanding - end of period		3,108,243		$	34.08

Exercisable - end of period		1,446,664		$	38.15

The following table sets forth the Company’s RSA/RSU activity:

	Nine Months Ended
	September 30, 2019
	Shares/Units
Outstanding and unvested - beginning of period		421,200
Granted		190,310
Vested		-
Forfeited		(66,040	)
Outstanding and unvested - end of period		545,470

Cumulative vested shares - end of period		1,913,916

Stock-based compensation expense recognized in the condensed consolidated statements of operations related to all outstanding stock based compensation awards is summarized below (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Total direct costs	$	1,807	$	875	$	5,085	$	2,619
Selling, general and administrative		7,659		557		12,949		1,767
Total stock-based compensation expense	$	9,466	$	1,432	$	18,034	$	4,386

Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

(11) Income Taxes

The Company’s effective income tax rate was 18.6% and 24.2% for the three months ended September 30, 2019 and 2018, respectively. The Company’s effective income tax rate was 20.3% and 22.0% for the nine months ended September 30, 2019 and 2018, respectively. The Company’s effective income tax rate for the three and nine months ended September 30, 2019 varied from the U.S. statutory rate of 21% primarily due to the impact of state taxes, which was favorably offset by previously acquired tax attributes and excess tax benefits recognized from share-based compensation.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

(12) Commitments and Contingencies

Legal Proceedings

The Company is involved in legal proceedings from time to time in the ordinary course of its business, including employment claims and claims related to other business transactions. The Company cannot predict with certainty the outcome of such proceedings, but it believes that adequate reserves have been recorded and losses already recognized with respect to such proceedings, which were immaterial as of September 30, 2019 and December 31, 2018. There is a reasonable possibility that a loss exceeding amounts already recognized may be incurred related to these actions; however, the Company believes that such potential losses were immaterial as of September 30, 2019.

Purchase Commitments

The Company has several minimum purchase commitments for project related supplies totaling $11.1 million. In return for the commitment, Medpace receives preferential pricing. The commitments expire at various times through 2026.

Related Party Transactions

9 Months Ended

Sep. 30, 2019

Related Party Transactions

(13) Related Party Transactions

Employee Loans

The Company periodically extends short term loans or advances to employees, typically upon commencement of employment. Total receivables as a result of these employee advances of $0.2 million existed at September 30, 2019 and December 31, 2018, respectively, and are included in the Prepaid expenses and other current assets and Other assets line items of the condensed consolidated balance sheets, respectively, depending on the contractual repayment date.

Service Agreements

Cymabay Therapeutics, Inc. (“Cymabay”)

Cymabay is a clinical-stage biopharmaceutical company developing therapies to treat metabolic diseases with high unmet medical need, including serious rare and orphan disorders. During the first quarter of 2016, it was announced that a Medpace employee would join Cymabay’s board of directors. The Company and Cymabay entered into a MSA dated October 21, 2016. Subsequently, the Company and Cymabay have entered into several task orders for the Company to perform clinical trial related services. During the three and nine months ended September 30, 2019, the Company recognized total revenue from Cymabay of $3.5 million and $9.4 million, respectively, and for the three and nine months ended September 30, 2018, the Company recognized total revenue from Cymabay of $4.1 million and $6.2 million, respectively, in the Company’s condensed consolidated statements of operations. As of September 30, 2019 and December 31, 2018, respectively, the Company had Advanced billings from Cymabay of $0.5 million and less than $0.1 million recorded in the condensed consolidated balance sheets. In addition, as of September 30, 2019 and December 31, 2018, respectively, the Company had Accounts receivable and unbilled, net from Cymabay of $0.6 million and $2.5 million recorded in the condensed consolidated balance sheets.

LIB Therapeutics LLC and subsidiaries (“LIB”)

Certain executives and employees of the Company, including the chief executive officer, are members of LIB’s board of managers. The Company entered into a MSA dated November 24, 2015 with LIB, a company that engages in research, development, marketing and commercialization of pharmaceutical drugs. Subsequently, the Company and LIB have entered into several task orders for the Company to perform clinical trial related services. During the three and nine months ended September 30, 2019, the Company recognized total revenue from LIB of $0.5 million and $1.5 million, respectively, and for the three and nine months ended September 30, 2018, the Company recognized total revenue from LIB of $1.0 million and $2.8 million, respectively, in the Company’s condensed consolidated statements of operations. As of September 30, 2019 and December 31, 2018, respectively, the Company had Advanced billings from LIB of $0.4 million and $0.3 million recorded in the condensed consolidated balance sheets. In addition, as of September 30, 2019 and December 31, 2018, respectively, the Company had Accounts receivable and unbilled, net from LIB of $0.1 million and $1.0 million recorded in the condensed consolidated balance sheets.

CinRX Pharma and subsidiaries (“CinRx”)

Certain executives and employees of the Company, including the chief executive officer, are members of CinRx’s board of managers and/or have equity investments in CinRx, a biotech company. The Company and CinRx have entered into several task orders for the Company to perform clinical trial related services. During the three and nine months ended September 30, 2019, the Company recognized total revenue from CinRx of $0.5 million and $2.8 million, respectively, and for the three and nine months ended September 30, 2018, the Company recognized total revenue from CinRx of less than $0.1 million and $0.2, respectively, in the Company’s consolidated statements of operations. As of September 30, 2019 and December 31, 2018, respectively, the Company had Advanced billings from CinRx of $0.4 million and $0.1 million recorded in the condensed consolidated balance sheets. In addition, as of September 30, 2019 and December 31, 2018 the Company had Accounts receivable and unbilled, net from CinRx of $0.4 million, respectively, in the condensed consolidated balance sheets.

The Summit, a Dolce Hotel (“The Summit”)

The Summit Hotel, located on the Medpace campus, is owned by the chief executive officer, and managed by an unrelated hospitality management entity. Medpace incurs travel lodging and meeting expenses at The Summit. For the three and nine months ended September 30, 2019, Medpace incurred expenses of $0.2 million and $0.5 million, respectively, at The Summit.

Medpace Investors, LLC (“MPI”)

MPI is a noncontrolling shareholder and related party of Medpace Holdings, Inc. MPI is owned and managed by employees of the Company. The chief executive officer of Medpace is also the manager and majority unit holder of MPI. The Company acted as a paying agent for MPI with taxing authorities principally in instances when employee tax payments or remittance of withholdings related to equity compensation are required. Refer to Note 10 of the Notes to Condensed Consolidated Financial Statements for details of the Tender Offer transaction. As of September 30, 2019, the Company had Prepaid expenses and other current assets from MPI of $0.3 million in the condensed consolidated balance sheets for tax-related receivables from the transaction.

Leased Real Estate

Headquarters Lease

The Company entered into an operating lease for its corporate headquarters with an entity that is wholly owned by the chief executive officer of the Company. The Company has evaluated its relationship with the related party and concluded that the related party is not a variable interest entity because the Company has no direct ownership interest or relationship other than the lease. The lease for headquarters is for an initial term of twelve years through November 2022 with a renewal option for one 10-year term at prevailing market rates. The Company pays rent, taxes, insurance, and maintenance expenses that arise from the use of the property. Annual base rent for its corporate headquarters allows for adjustments to the rental rate annually for increases in the consumer price index. Under ASC 842, operating lease cost recognized for the three and nine months ended September 30, 2019 was $0.5 million and $1.5 million, respectively. Under ASC 840, lease expense recognized for the three and nine months ended September 30, 2018 was $0.5 million and $1.6 million, respectively. The lease expense was allocated between Total direct costs and Selling, general and administrative in the condensed consolidated statements of operations.

In 2018, Medpace, Inc. entered into a multi-year lease agreement governing future occupancy of additional office space in Cincinnati, Ohio. The lease expires in 2040 and the Company has two 10-year options to extend the term of the lease.

ASC 842 – Operating Leases

The Company entered into two multi-year lease agreements governing the occupancy of space of two buildings in Cincinnati, Ohio with an entity that is wholly owned by the Company’s chief executive officer and certain members of his immediate family. The Company assumed occupancy in 2012 and the leases expire in 2027 with the Company having one 10-year option to extend the lease term. The Company pays rent, taxes, insurance, and maintenance expenses that arise from the use of the property. Annual base rent for the corporate headquarters allows for adjustments to the rental rate annually for increases in the consumer price index. Under ASC 842, the Company has determined that the leases are operating leases. Operating lease cost recognized for the three and nine months ended September 30, 2019 is $0.9 million and $2.7 million, respectively. The lease cost was allocated between Total direct costs and Selling, general and administrative in the condensed consolidated statements of operations.

ASC 840 – Deemed Assets and Deemed Landlord Liabilities

In accordance with the accounting guidance related to leases under ASC 840, the Company was deemed in substance to be the owner of the property during the construction phase and at completion. Accordingly, the Company reflected the buildings and related liabilities as deemed assets from landlord building construction in Property and equipment, net, Other current liabilities, and Deemed landlord liability, less current portion, respectively, on the condensed consolidated balance sheets. The deemed assets were being fully depreciated, on a straight line basis, over the 15-year term of the lease. Deemed landlord liabilities were recorded at their net present value when the Company enters into qualifying leases and are reduced as the Company makes periodic lease payments on the properties. Accretion expense was being recorded over the term of the lease as a component of Interest expense, net in the Company’s condensed consolidated statements of operations. The Company paid $1.0 million and $2.9 million during the three and nine months ended September 30, 2018. The current and long-term portions of the Deemed landlord liability at December 31, 2018 were $2.1 million and $24.5 million, respectively. The Company has recognized deemed assets, net of $14.6 million at December 31, 2018 in the condensed consolidated balance sheets.

Travel Services

The Company incurs expenses for travel services for company executives provided by a private aviation charter company that is owned by the chief executive officer and the executive vice president of operations of the Company (“private aviation charter”). The Company may contract directly with the private aviation charter for the use of its aircraft or indirectly through a third party aircraft management and jet charter company (the “Aircraft Management Company”). The travel services provided are primarily for business purposes, with certain personal travel paid for as part of the executives’ compensation arrangements. The Aircraft Management Company also makes the private aviation charter aircraft available to third parties. The Company incurred travel expenses of $0.3 million and $0.4 million during the three months ended September 30, 2019 and 2018, respectively, and $0.9 million and $1.0 million during the nine months ended September 30, 2019 and 2018, respectively, related to these travel services. These travel expenses are recorded in Selling, general and administrative in the Company’s condensed consolidated statements of operations. As of September 30, 2019 and December 31, 2018, the Company had Accounts payable due to Aircraft Management Company of $0.1 million and $0.2 million, respectively, in the condensed consolidated balance sheets.

Entity Wide Disclosures

9 Months Ended

Sep. 30, 2019

Entity Wide Disclosures [Abstract]

Entity Wide Disclosures

(14) Entity Wide Disclosures

Revenue by Category

The following table disaggregates our revenue by major source (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Therapeutic Area
Oncology	$	65,529	$	48,947	$	186,152	$	135,824
Other		53,484		42,200		158,676		114,852
Metabolic		34,919		30,037		102,287		90,748
AVAI		24,243		21,947		66,831		59,497
Cardiology		21,733		22,227		68,792		71,262
Central Nervous System		16,330		13,895		48,345		40,291
Total revenue	$	216,238	$	179,253	$	631,083	$	512,474

In the current quarter and for all periods presented, the revenue associated with medical device projects, previously a separate therapeutic area, has been included in the respective therapeutic area that best aligns with the therapeutic focus of the medical device project and represents how management evaluates disaggregated revenue in its internal reporting.

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Unaudited Interim Financial Information

Lease Recognition

Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option as determined at lease commencement.

Many of our lease agreements have both lease and non-lease components, which the Company has elected to treat as a single lease component for recognition purposes.

Recently Adopted Accounting Standards

The impact of the adoption of ASC 842 as of January 1, 2019 is as follows:

ASSETS	As of
	January 1, 2019			Adjustments			December 31, 2018
Current assets:
Prepaid expenses and other current assets		21,013			(370	)		21,383
Total current assets		177,744			(370	)		178,114
Property and equipment, net		37,613			(14,642	)		52,255
Operating lease right-of-use assets		51,854			51,854			-
Total assets	$	1,004,775		$	36,842		$	967,933
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Other current liabilities		10,951			6,090			4,861
Total current liabilities		263,116			6,090			257,026
Operating lease liabilities		45,294			45,294			-
Deemed landlord liability, less current portion		-			(24,484	)		24,484
Deferred income tax liability		3,158			2,719			439
Other long-term liabilities		14,630			(1,930	)		16,560
Total liabilities		405,919			27,689			378,230
Shareholders’ equity:
Accumulated deficit		(32,334	)		9,153			(41,487	)
Total shareholders’ equity		598,856			9,153			589,703
Total liabilities and shareholders’ equity	$	1,004,775		$	36,842		$	967,933

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2019

ASU 2016-02

Summary of Impact of Adoption of Accounting Standards

The impact of the adoption of ASC 842 as of January 1, 2019 is as follows:

ASSETS	As of
	January 1, 2019			Adjustments			December 31, 2018
Current assets:
Prepaid expenses and other current assets		21,013			(370	)		21,383
Total current assets		177,744			(370	)		178,114
Property and equipment, net		37,613			(14,642	)		52,255
Operating lease right-of-use assets		51,854			51,854			-
Total assets	$	1,004,775		$	36,842		$	967,933
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Other current liabilities		10,951			6,090			4,861
Total current liabilities		263,116			6,090			257,026
Operating lease liabilities		45,294			45,294			-
Deemed landlord liability, less current portion		-			(24,484	)		24,484
Deferred income tax liability		3,158			2,719			439
Other long-term liabilities		14,630			(1,930	)		16,560
Total liabilities		405,919			27,689			378,230
Shareholders’ equity:
Accumulated deficit		(32,334	)		9,153			(41,487	)
Total shareholders’ equity		598,856			9,153			589,703
Total liabilities and shareholders’ equity	$	1,004,775		$	36,842		$	967,933

Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Reconciliation of Denominators and Additional Shares that are Excluded from the Calculation of EPS

The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2019 and 2018 (in thousands, except for earnings per share):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Weighted-average shares:
Common shares outstanding		35,939		35,569		35,829		35,525
RSAs		98		141		101		144
Total weighted-average shares		36,037		35,710		35,930		35,669
Earnings per common share—Basic
Net income	$	23,977	$	19,305	$	70,630	$	50,424
Less: Undistributed earnings allocated to RSAs		65		76		199		204
Net income available to common shareholders—Basic	$	23,912	$	19,229	$	70,431	$	50,220

Net income per common share—Basic	$	0.67	$	0.54	$	1.97	$	1.41

Basic weighted-average common shares outstanding		35,939		35,569		35,829		35,525
Effect of diluted shares		1,896		1,556		1,678		1,270
Diluted weighted-average shares outstanding		37,835		37,125		37,507		36,795

Net income per common share—Diluted	$	0.63	$	0.52	$	1.88	$	1.36

Contract Assets and Contract Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Summary of Company's Contract Asset and Contract Liability

Accounts receivable and unbilled, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Accounts receivable	$	113,931		$	85,120
Unbilled receivables		26,987			49,361
Less: allowance for doubtful accounts		(729	)		(1,032	)
Total accounts receivable and unbilled, net	$	140,189		$	133,449

Advanced billings consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Advanced billings	$	169,529	$	147,935

Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets, Net

Intangible assets, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Intangible assets:
Finite-lived intangible assets:
Carrying amount:
Backlog	$	72,630		$	72,630
Customer relationships		145,051			145,051
Developed technologies		54,475			54,475
Other		3,074			3,074
Total finite-lived intangible assets		275,230			275,230
Accumulated amortization:
Backlog		(72,630	)		(72,630	)
Customer relationships		(119,478	)		(110,636	)
Developed technologies		(54,475	)		(51,751	)
Other		(2,948	)		(2,680	)
Total accumulated amortization		(249,531	)		(237,697	)
Total finite-lived intangible assets, net		25,699			37,533
Trade name (indefinite-lived)		31,646			31,646
Total intangible assets, net	$	57,345		$	69,179

Schedule of Estimated Amortization Expense of Intangible Assets

As of September 30, 2019, estimated amortization expense of the Company’s intangible assets for each of the next five years and thereafter is as follows (in thousands):

	Amortization
Remainder of 2019	$	2,995
2020		7,876
2021		5,114
2022		3,353
2023		2,199
Later years		4,162
	$	25,699

Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Employee compensation and benefits	$	31,458	$	31,344
Project related reimbursable expenses		63,799		51,109
Other		7,278		5,040
Total accrued expenses	$	102,535	$	87,493

Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Debt

Debt consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Term loan	$	-	$	80,438
Less unamortized discount		-		(282	)
Less unamortized term loan debt issuance costs		-		(435	)
Long-term debt, net, less current portion	$	-	$	79,721

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Name Accounting Standards Codification
-Topic 835
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 942
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 835
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Summary of Components of Lease Expense

The components of lease expense as of September 30, 2019 were as follows (in thousands):

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	3,241	$	9,578
Variable lease cost		649		1,995

Summary of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information for the nine months ended September 30, 2019 related to the leases was as follows (in thousands):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	6,979

Right-of-use assets obtained in exchange for lease obligations:
Operating leases		8,476

Summary of Supplemental Balance Sheet Information Related to Leases

Supplemental balance sheet information as of September 30, 2019 related to the leases was as follows (in thousands):

	As of September 30, 2019
Operating lease right-of-use assets	$	52,479

Other current liabilities	$	10,249
Operating lease liabilities		46,022
Total operating lease liabilities	$	56,271

Weighted Average Remaining Lease Term (years)
Operating leases	6.6
Weighted Average Discount Rate
Operating leases		6.1	%

Schedule of Lease Payments Due Related To Lease Liabilities

Lease payments due related to lease liabilities as of September 30, 2019 were as follows (in thousands):

	Operating Leases
Remainder of 2019	$	3,151
2020		12,416
2021		12,142
2022		9,644
2023		7,378
Later years		24,411
Total lease payments		69,142
Less: imputed interest		(12,871	)
Total	$	56,271

Schedule of Future Minimum Rental Payments for Lease Obligations under ASC 840

Future minimum rental payments for lease obligations with initial terms in excess of one year as of December 31, 2018 are as follows (in thousands):

			Non-Related		Total
	Related Party		Parties Operating		Operating
	Operating Lease		Leases		Leases
2019	$	1,987	$	6,186	$	8,173
2020		6,843		6,617		13,460
2021		6,964		5,873		12,837
2022		6,757		3,694		10,451
2023		5,229		3,257		8,486
Thereafter		103,870		5,752		109,622
Total minimum lease payments	$	131,650	$	31,379	$	163,029

Schedule of Minimum Annual Payments Required in Conjunction with Landlord Liability under ASC 840

Minimum annual payments required in conjunction with the Deemed landlord liabilities as of December 31, 2018 are as follows (in thousands):

	Related Party				Total
	Minimum Lease		Less:		Principal
	Payments		Interest		Amounts Due
2019	$	3,918	$	1,818	$	2,100
2020		3,988		1,662		2,326
2021		4,039		1,490		2,549
2022		4,092		1,301		2,791
2023		4,145		1,095		3,050
Thereafter		15,697		1,929		13,768
Total	$	35,879	$	9,295	$	26,584

Shareholder's Equity and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of Stock Option Activity

The following table sets forth the Company’s stock option activity:

	Nine Months Ended September 30, 2019
				Weighted Average
	Stock Options			Exercise Price
Outstanding - beginning of period		2,945,040		$	24.18
Granted		856,939		$	54.90
Exercised		(345,815	)	$	16.28
Forfeited/Expired		(347,921	)	$	19.29
Outstanding - end of period		3,108,243		$	34.08

Exercisable - end of period		1,446,664		$	38.15

Schedule of RSA/RSU Activity

The following table sets forth the Company’s RSA/RSU activity:

	Nine Months Ended
	September 30, 2019
	Shares/Units
Outstanding and unvested - beginning of period		421,200
Granted		190,310
Vested		-
Forfeited		(66,040	)
Outstanding and unvested - end of period		545,470

Cumulative vested shares - end of period		1,913,916

Summary of Stock-Based Compensation Expense Recognized in Statements of Operations Related to All Outstanding Stock Based Compensation Awards

Stock-based compensation expense recognized in the condensed consolidated statements of operations related to all outstanding stock based compensation awards is summarized below (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Total direct costs	$	1,807	$	875	$	5,085	$	2,619
Selling, general and administrative		7,659		557		12,949		1,767
Total stock-based compensation expense	$	9,466	$	1,432	$	18,034	$	4,386

Entity Wide Disclosures (Tables)

9 Months Ended

Sep. 30, 2019

Entity Wide Disclosures [Abstract]

Summary of Revenue by Major Source

The following table disaggregates our revenue by major source (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Therapeutic Area
Oncology	$	65,529	$	48,947	$	186,152	$	135,824
Other		53,484		42,200		158,676		114,852
Metabolic		34,919		30,037		102,287		90,748
AVAI		24,243		21,947		66,831		59,497
Cardiology		21,733		22,227		68,792		71,262
Central Nervous System		16,330		13,895		48,345		40,291
Total revenue	$	216,238	$	179,253	$	631,083	$	512,474

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	$ 38,296	$ (41,487)
Accounts receivable and unbilled, net	140,189	133,449
Deferred income tax liability	5,578	439
Accrued expenses	102,535	87,493
Advanced billings	$ 169,529	$ 147,935
ASU 2014-09 \| Impact of Adoption of ASC 606 - Adjustments
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit			$ 5,700
Accounts receivable and unbilled, net			23,900
Deferred income tax liability			(1,600)
Accrued expenses			35,100
Pre-funded study costs			(57,400)
Advanced billings			$ 38,900

Summary of Significant Accounting Policies - Summary of Impact of Adoption of Accounting Standards (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Prepaid expenses and other current assets	$ 30,918				$ 21,383
Total current assets	250,397				178,114
Property and equipment, net	43,715				52,255
Operating lease right-of-use assets	52,479				0
Total assets	1,072,329				967,933
Current liabilities:
Other current liabilities	21,644				4,861
Total current liabilities	314,392				257,026
Operating lease liabilities	46,022				0
Deemed landlord liability, less current portion	0				24,484
Deferred income tax liability	5,578				439
Other long-term liabilities	14,330				16,560
Total liabilities	380,322				378,230
Shareholders’ equity:
Accumulated deficit	38,296				(41,487)
Total shareholders’ equity	692,007	$ 658,055	$ 621,897		589,703	$ 564,435	$ 543,127	$ 526,473	$ 503,530
Total liabilities and shareholders’ equity	$ 1,072,329				$ 967,933
ASU 2016-02
Current assets:
Prepaid expenses and other current assets				$ 21,013
Total current assets				177,744
Property and equipment, net				37,613
Operating lease right-of-use assets				51,854
Total assets				1,004,775
Current liabilities:
Other current liabilities				10,951
Total current liabilities				263,116
Operating lease liabilities				45,294
Deemed landlord liability, less current portion				0
Deferred income tax liability				3,158
Other long-term liabilities				14,630
Total liabilities				405,919
Shareholders’ equity:
Accumulated deficit				(32,334)
Total shareholders’ equity				598,856
Total liabilities and shareholders’ equity				1,004,775
ASU 2016-02 \| Adjustments
Current assets:
Prepaid expenses and other current assets				(370)
Total current assets				(370)
Property and equipment, net				(14,642)
Operating lease right-of-use assets				51,854
Total assets				36,842
Current liabilities:
Other current liabilities				6,090
Total current liabilities				6,090
Operating lease liabilities				45,294
Deemed landlord liability, less current portion				(24,484)
Deferred income tax liability				2,719
Other long-term liabilities				(1,930)
Total liabilities				27,689
Shareholders’ equity:
Accumulated deficit				9,153
Total shareholders’ equity				9,153
Total liabilities and shareholders’ equity				$ 36,842

Net Income Per Share - Schedule of Reconciliation of Denominators and Additional Shares that are Excluded from the Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Weighted-average shares:
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525
Total weighted-average shares	36,037			35,710			35,930	35,669
Earnings per common share—Basic
Net income	$ 23,977	$ 27,455	$ 19,198	$ 19,305	$ 16,568	$ 14,551	$ 70,630	$ 50,424
Net income available to common shareholders—Basic	$ 23,912			$ 19,229			$ 70,431	$ 50,220
Net income per common share—Basic	$ 0.67			$ 0.54			$ 1.97	$ 1.41
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525
Effect of diluted shares	1,896			1,556			1,678	1,270
Diluted weighted-average shares outstanding	37,835			37,125			37,507	36,795
Net income per common share—Diluted	$ 0.63			$ 0.52			$ 1.88	$ 1.36
RSAs
Weighted-average shares:
Basic weighted-average common shares outstanding	98			141			101	144
Earnings per common share—Basic
Less: Undistributed earnings allocated to RSAs	$ 65			$ 76			$ 199	$ 204
Basic weighted-average common shares outstanding	98			141			101	144
Common Stock
Weighted-average shares:
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525
Earnings per common share—Basic
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525

Net Income Per Share - Additional Information (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted EPS	245,000	13,420	245,000	13,420

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair value measurements transfers between level 1, level 2 or level 3	$ 0	$ 0	$ 0	$ 0

Contract Assets and Contract Liabilities - Summary of Accounts Receivable and Unbilled, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Accounts receivable	$ 113,931	$ 85,120
Unbilled receivables	26,987	49,361
Less: allowance for doubtful accounts	(729)	(1,032)
Total accounts receivable and unbilled, net	$ 140,189	$ 133,449

Contract Assets and Contract Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Unbilled receivables	$ 26,987	$ 49,361
Advanced billings	169,529	$ 147,935
Performance obligations remaining to be performed	$ 1,360,000

Contract Assets and Contract Liabilities - Summary of Advanced Billings (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Advanced billings	$ 169,529	$ 147,935

Intangible Assets, Net - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-lived intangible assets:
Total finite-lived intangible assets	$ 275,230	$ 275,230
Accumulated amortization:
Total accumulated amortization	(249,531)	(237,697)
Total finite-lived intangible assets, net	25,699	37,533
Trade name (indefinite-lived)	31,646	31,646
Total intangible assets, net	57,345	69,179
Backlog
Finite-lived intangible assets:
Total finite-lived intangible assets	72,630	72,630
Accumulated amortization:
Total accumulated amortization	(72,630)	(72,630)
Customer Relationships
Finite-lived intangible assets:
Total finite-lived intangible assets	145,051	145,051
Accumulated amortization:
Total accumulated amortization	(119,478)	(110,636)
Developed Technologies
Finite-lived intangible assets:
Total finite-lived intangible assets	54,475	54,475
Accumulated amortization:
Total accumulated amortization	(54,475)	(51,751)
Other
Finite-lived intangible assets:
Total finite-lived intangible assets	3,074	3,074
Accumulated amortization:
Total accumulated amortization	$ (2,948)	$ (2,680)

Intangible Assets, Net - Schedule of Estimated Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 2,995
2020	7,876
2021	5,114
2022	3,353
2023	2,199
Later years	4,162
Total finite-lived intangible assets, net	$ 25,699	$ 37,533

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accrued Liabilities And Other Liabilities [Abstract]
Employee compensation and benefits	$ 31,458	$ 31,344
Project related reimbursable expenses	63,799	51,109
Other	7,278	5,040
Total accrued expenses	$ 102,535	$ 87,493

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less unamortized discount	$ 0	$ (282)
Long-term debt, net, less current portion	0	79,721
Term loan
Debt Instrument [Line Items]
Debt	0	80,438
Less unamortized term loan debt issuance costs	$ 0	$ (435)

Debt - Additional Information (Details) - USD ($)		3 Months Ended
Debt - Additional Information (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2019	Jun. 30, 2019
Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 0	$ 0
Outstanding letters of credit	200,000	200,000
Maximum \| Credit Facility
Debt Instrument [Line Items]
Debt instrument, principal amount	50,000,000.0	50,000,000.0
Senior Secured Credit Agreement \| Senior Secured Term Loan Facility \| Selling, General and Administrative Expenses
Debt Instrument [Line Items]
Unamortized term loan issuance fees			$ 300,000
Senior Secured Credit Agreement \| Senior Secured Term Loan Facility \| Interest Expense, Net
Debt Instrument [Line Items]
Amortization of debt discount			$ 200,000
Loan Agreement \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Unamortized term loan issuance fees	0	0
Drawn amount	0
Accrued commitment fees	$ 100,000
Amortized loan issuance fees		700,000
Loan Agreement \| Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis points	1.00%
Debt instrument, term	364 days
Loan Agreement \| Selling, General and Administrative Expenses \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Amortized loan issuance fees		500,000
Loan Agreement \| Interest Expense, Net \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Amortized loan issuance fees		$ 200,000

Leases - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Leases - Additional Information (Details) $ in Millions	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Option	Sep. 30, 2018 USD ($)
Lessee Lease Description [Line Items]
Rent expense under ASC 840	$ 2.3		$ 6.9
Real Estate and Equipment
Lessee Lease Description [Line Items]
Lease renewal term, operating lease		20 years
Description of option to extend the lease		Many of the Company’s leases include options to extend the leases on a month to month basis or for set periods for up to 20 years.
Operating lease, existense of option to extend		true
Description of option to terminate the lease		Many leases also include options to terminate the leases within 1 year or per other contractual terms.
Lessee, operating lease, existence of option to terminate		true
Real Estate and Equipment \| Minimum
Lessee Lease Description [Line Items]
Remaining lease term, operating lease		1 year
Real Estate and Equipment \| Maximum
Lessee Lease Description [Line Items]
Remaining lease term, operating lease		20 years
Operating lease, options to terminate lease term		1 year
Corporate Offices
Lessee Lease Description [Line Items]
Initial term of operating lease not yet commenced		20 years
Lease not yet commenced, option to extend		true
Lease not yet commenced, option to extend description		renewal option for two 10-year terms at prevailing market rates.
Operating lease not yet commenced, renewal term		10 years
Operating lease not yet commenced, number of renewal option \| Option		2
Operating lease not yet commenced, future payments		$ 124.0

Leases - Summary of Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease Cost [Abstract]
Operating lease cost	$ 3,241	$ 9,578
Variable lease cost	$ 649	$ 1,995

Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 6,979
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 8,476

Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets And Liabilities Lessee [Abstract]
Operating lease right-of-use assets	$ 52,479	$ 0
Other current liabilities	$ 10,249
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities	$ 46,022	$ 0
Total operating lease liabilities	$ 56,271
Weighted Average Remaining Lease Term (years)
Operating leases	6 years 7 months 6 days
Weighted Average Discount Rate
Operating leases	6.10%

Leases - Schedule of Lease Payments Due Related To Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Lease Liabilities Payments Due [Abstract]
Remainder of 2019	$ 3,151
2020	12,416
2021	12,142
2022	9,644
2023	7,378
Later years	24,411
Total lease payments	69,142
Less: imputed interest	(12,871)
Total	$ 56,271

Leases - Schedule of Future Minimum Rental Payments for Lease Obligations under ASC 840 (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, 2019	$ 8,173
Operating Leases, 2020	13,460
Operating Leases, 2021	12,837
Operating Leases, 2022	10,451
Operating Leases, 2023	8,486
Operating Leases, Thereafter	109,622
Operating Leases, Total minimum lease payments	163,029
Related Party
Operating Leased Assets [Line Items]
Operating Leases, 2019	1,987
Operating Leases, 2020	6,843
Operating Leases, 2021	6,964
Operating Leases, 2022	6,757
Operating Leases, 2023	5,229
Operating Leases, Thereafter	103,870
Operating Leases, Total minimum lease payments	131,650
Non-Related Party
Operating Leased Assets [Line Items]
Operating Leases, 2019	6,186
Operating Leases, 2020	6,617
Operating Leases, 2021	5,873
Operating Leases, 2022	3,694
Operating Leases, 2023	3,257
Operating Leases, Thereafter	5,752
Operating Leases, Total minimum lease payments	$ 31,379

Leases - Schedule of Minimum Annual Payments Required in Conjunction with Landlord Liability under ASC 840 (Details) - Deemed Landlord Liabilities $ in Thousands	Dec. 31, 2018 USD ($)
Schedule Of Capital Leased Assets [Line Items]
Related Party Minimum Lease Payments, 2019	$ 3,918
Related Party Minimum Lease Payments, 2020	3,988
Related Party Minimum Lease Payments, 2021	4,039
Related Party Minimum Lease Payments, 2022	4,092
Related Party Minimum Lease Payments, 2023	4,145
Related Party Minimum Lease Payments, Thereafter	15,697
Related Party Minimum Lease Payments, Total	35,879
Related Party Minimum Lease Payments, Interest, 2019	1,818
Related Party Minimum Lease Payments, Interest, 2020	1,662
Related Party Minimum Lease Payments, Interest, 2021	1,490
Related Party Minimum Lease Payments, Interest, 2022	1,301
Related Party Minimum Lease Payments, Interest, 2023	1,095
Related Party Minimum Lease Payments, Interest, Thereafter	1,929
Related Party Minimum Lease Payments, Interest, Total	9,295
Total Principal Amounts Due, 2019	2,100
Total Principal Amounts Due, 2020	2,326
Total Principal Amounts Due, 2021	2,549
Total Principal Amounts Due, 2022	2,791
Total Principal Amounts Due, 2023	3,050
Total Principal Amounts Due, Thereafter	13,768
Total Principal Amounts Due, Total	$ 26,584

Shareholder's Equity and Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		856,939
2016 Incentive Award Plan \| Granted to Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees		778,986	722,200
2016 Incentive Award Plan \| Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted			33,801
2016 Incentive Award Plan \| Vesting After Four Years \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		10,000	443,000
Award vesting period		4 years	4 years
2016 Incentive Award Plan \| Vesting After Four Years \| Restricted Stock Units (RSU)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		4 years	4 years
Shares granted		190,310	279,200
2016 Incentive Award Plan \| Vesting After One Year
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		5,000
Award vesting period		1 year
2016 Incentive Award Plan \| Vesting After One Year \| Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		38,832
Award vesting period		1 year
2016 Incentive Award Plan \| Fully-vested Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		551,676
2016 Incentive Award Plan \| Vesting in Twelve Equal Monthly Installments
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		22,000
2014 Incentive Award Plan \| Stock Options \| MPI \| Tender Offer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vested options purchased by related party	229,431
2014 Incentive Award Plan \| Stock Options \| MPI \| Selling, General and Administrative Expenses \| Tender Offer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 5.1	$ 5.1

Shareholder's Equity and Stock-Based Compensation - Schedule of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Equity [Abstract]
Number of Stock Options, Outstanding - beginning of period \| shares	2,945,040
Number of Stock Options, Granted \| shares	856,939
Number of Stock Options, Exercised \| shares	(345,815)
Number of Stock Options, Forfeited/Expired \| shares	(347,921)
Number of Stock Options, Outstanding - end of period \| shares	3,108,243
Number of Stock Options, Exercisable - end of period \| shares	1,446,664
Weighted Average Exercise Price, Outstanding - beginning of Period \| $ / shares	$ 24.18
Weighted Average Exercise Price, Granted \| $ / shares	54.90
Weighted Average Exercise Price, Exercised \| $ / shares	16.28
Weighted Average Exercise Price, Forfeited/Expired \| $ / shares	19.29
Weighted Average Exercise Price, Outstanding - end of period \| $ / shares	34.08
Weighted Average Exercise Price, Exercisable - end of period \| $ / shares	$ 38.15

Shareholder's Equity and Stock-Based Compensation - Schedule of RSA/RSU Activity (Details) - RSA/RSU	9 Months Ended
	Sep. 30, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding and unvested - beginning of period	421,200
Granted	190,310
Vested	0
Forfeited	(66,040)
Outstanding and unvested - end of period	545,470
Cumulative vested shares - end of period	1,913,916

Shareholder's Equity and Stock-Based Compensation - Summary of Stock-Based Compensation Expense Recognized in Statements of Operations Related to All Outstanding Stock Based Compensation Awards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 9,466	$ 1,432	$ 18,034	$ 4,386
Total Direct Costs
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,807	875	5,085	2,619
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 7,659	$ 557	$ 12,949	$ 1,767

Income Taxes - Additional Information (Details)	3 Months Ended		9 Months Ended
Income Taxes - Additional Information (Details)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	18.60%	24.20%	20.30%	22.00%
U.S. statutory rate	21.00%		21.00%

Commitments and Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Minimum purchase commitments for project related supplies	$ 11.1
Minimum purchase commitments, description	The Company has several minimum purchase commitments for project related supplies totaling $11.1 million. In return for the commitment, Medpace receives preferential pricing. The commitments expire at various times through 2026.

Related Party Transactions - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) RenewalOption Agreement Building	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) RenewalOption
Related Party Transaction [Line Items]
Advanced billings	$ 1,300		$ 1,300		$ 400
Accounts receivable and unbilled, net	1,100		1,100		3,800
Operating lease cost recognized	3,241		9,578
Lease expense recognized under 840		$ 2,300		$ 6,900
Deemed landlord liability, long-term portions, under ASC 840	0		0		24,484
Accounts payable due to related party	100		100		300
Prepaid Expenses and Other Current Assets \| Medpace Investors, LLC \| Tax Related Receivables
Related Party Transaction [Line Items]
Due from related party	300		300
Employee Loans \| Prepaid Expenses and Other Current Assets and Other Assets
Related Party Transaction [Line Items]
Employee advances receivables	200		200		200
Service Agreements \| Cymabay
Related Party Transaction [Line Items]
Advanced billings	500		500
Accounts receivable and unbilled, net	600		600		2,500
Service Agreements \| Cymabay \| Maximum
Related Party Transaction [Line Items]
Advanced billings					100
Service Agreements \| Cymabay \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	3,500	4,100	9,400	6,200
Service Agreements \| LIB
Related Party Transaction [Line Items]
Advanced billings	400		400		300
Accounts receivable and unbilled, net	100		100		1,000
Service Agreements \| LIB \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	500	1,000	1,500	2,800
Service Agreements \| CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Advanced billings	400		400		100
Accounts receivable and unbilled, net	400		400		$ 400
Service Agreements \| CinRx Pharma and Subsidiaries \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	500		2,800
Service Agreements \| CinRx Pharma and Subsidiaries \| Revenue Net \| Maximum
Related Party Transaction [Line Items]
Revenue with related parties		100		200
Service Agreements \| The Summit
Related Party Transaction [Line Items]
Expenses incurred	$ 200		$ 500
Leased Real Estate
Related Party Transaction [Line Items]
Number of lease renewal, option \| RenewalOption					2
Lease term upon renewal					10 years
Lease expiration year					2040
Deemed assets, term of lease under ASC 840					15 years
Related party capital lease payments under ASC 840		1,000		2,900
Deemed landlord liability, current, under ASC 840					$ 2,100
Deemed landlord liability, long-term portions, under ASC 840					24,500
Leased Real Estate \| Chief Executive Officer
Related Party Transaction [Line Items]
Term of lease	12 years		12 years
Lease expiration period			2022-11
Number of lease renewal, option \| RenewalOption			1
Lease term upon renewal	10 years		10 years
Operating lease cost recognized	$ 500		$ 1,500
Lease expense recognized under 840		500		1,600
Leased Real Estate \| Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Number of lease renewal, option \| RenewalOption			1
Lease term upon renewal	10 years		10 years
Operating lease cost recognized	$ 900		$ 2,700
Lease expiration year			2027
Number of lease agreements \| Agreement			2
Number of buildings \| Building			2
Lease occupancy year			2012
Existense of option to extend			true
Description of option to extend			Company having one 10-year option to extend the lease term
Leased Real Estate \| Property and Equipment, Net \| Building
Related Party Transaction [Line Items]
Deemed assets, net, under ASC 840					14,600
Travel Services \| Chief Executive Officer
Related Party Transaction [Line Items]
Travel expenses with related party	300	$ 400	$ 900	$ 1,000
Accounts payable due to related party	$ 100		$ 100		$ 200

Entity Wide Disclosures - Summary of Revenue by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 216,238	$ 179,253	$ 631,083	$ 512,474
Oncology
Disaggregation Of Revenue [Line Items]
Total revenue	65,529	48,947	186,152	135,824
Other
Disaggregation Of Revenue [Line Items]
Total revenue	53,484	42,200	158,676	114,852
Metabolic
Disaggregation Of Revenue [Line Items]
Total revenue	34,919	30,037	102,287	90,748
AVAI
Disaggregation Of Revenue [Line Items]
Total revenue	24,243	21,947	66,831	59,497
Cardiology
Disaggregation Of Revenue [Line Items]
Total revenue	21,733	22,227	68,792	71,262
Central Nervous System
Disaggregation Of Revenue [Line Items]
Total revenue	$ 16,330	$ 13,895	$ 48,345	$ 40,291

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Oct. 25, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	MEDP
Security Exchange Name	NASDAQ
Entity Registrant Name	Medpace Holdings, Inc.
Entity Central Index Key	0001668397
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		36,030,398
Entity File Number	001-37856
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	32-0434904
Entity Address, Address Line One	5375 Medpace Way
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45227
City Area Code	(513)
Local Phone Number	579-9911
Title of 12(b) Security	Common Stock $0.01 par value
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 79,290	$ 23,275
Restricted cash	0	7
Accounts receivable and unbilled, net (includes $1.1 million and $3.8 million with related parties at September 30, 2019 and December 31, 2018, respectively)	140,189	133,449
Prepaid expenses and other current assets	30,918	21,383
Total current assets	250,397	178,114
Property and equipment, net	43,715	52,255
Operating lease right-of-use assets	52,479	0
Goodwill	662,427	660,981
Intangible assets, net	57,345	69,179
Deferred income taxes	293	713
Other assets	5,673	6,691
Total assets	1,072,329	967,933
Current liabilities:
Accounts payable (includes $0.1 million and $0.3 million with related parties at September 30, 2019 and December 31, 2018, respectively)	20,684	16,737
Accrued expenses	102,535	87,493
Advanced billings (includes $1.3 million and $0.4 million with related parties at September 30, 2019 and December 31, 2018, respectively)	169,529	147,935
Other current liabilities	21,644	4,861
Total current liabilities	314,392	257,026
Long-term debt, net, less current portion	0	79,721
Operating lease liabilities	46,022	0
Deemed landlord liability, less current portion	0	24,484
Deferred income tax liability	5,578	439
Other long-term liabilities	14,330	16,560
Total liabilities	380,322	378,230
Commitments and contingencies (see Note 12)
Shareholders’ equity:
Preferred stock - $0.01 par-value; 5,000,000 shares authorized; no shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at September 30, 2019 and December 31, 2018, respectively; 36,011,725 and 35,665,910 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	360	356
Treasury stock - 200,000 shares at September 30, 2019 and December 31, 2018, respectively	(6,030)	(6,030)
Additional paid-in capital	663,044	639,381
Retained earnings (accumulated deficit)	38,296	(41,487)
Accumulated other comprehensive loss	(3,663)	(2,517)
Total shareholders’ equity	692,007	589,703
Total liabilities and shareholders’ equity	$ 1,072,329	$ 967,933

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Accounts receivable, unbilled services with related parties	$ 1.1	$ 3.8
Accounts payable includes related parties	0.1	0.3
Advanced billings with related parties	$ 1.3	$ 0.4
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock shares authorized	5,000,000	5,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock shares authorized	250,000,000	250,000,000
Common stock shares issued	36,011,725	35,665,910
Common stock shares outstanding	36,011,725	35,665,910
Treasury stock shares	200,000	200,000

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue, net (includes $4.6 million and $5.1 million with related parties for the three months ended September 30, 2019 and 2018, respectively, and $13.7 million and $9.2 million with related parties for the nine months ended September 30, 2019 and 2018, respectively)	$ 216,238	$ 179,253	$ 631,083	$ 512,474
Operating expenses:
Direct service costs, excluding depreciation and amortization	81,086	62,520	235,522	184,339
Reimbursed out-of-pocket expenses	70,984	61,476	212,563	173,587
Total direct costs	152,070	123,996	448,085	357,926
Selling, general and administrative	29,120	18,606	73,984	55,112
Depreciation	2,062	2,343	6,035	6,883
Amortization	2,995	7,390	11,834	22,171
Total operating expenses	186,247	152,335	539,938	442,092
Income from operations	29,991	26,918	91,145	70,382
Other expense, net:
Miscellaneous (expense) income, net	(273)	482	(574)	807
Interest expense, net	(253)	(1,941)	(1,956)	(6,558)
Total other expense, net	(526)	(1,459)	(2,530)	(5,751)
Income before income taxes	29,465	25,459	88,615	64,631
Income tax provision	5,488	6,154	17,985	14,207
Net income	$ 23,977	$ 19,305	$ 70,630	$ 50,424
Net income per share attributable to common shareholders:
Basic	$ 0.67	$ 0.54	$ 1.97	$ 1.41
Diluted	$ 0.63	$ 0.52	$ 1.88	$ 1.36
Weighted average common shares outstanding:
Basic	35,939	35,569	35,829	35,525
Diluted	37,835	37,125	37,507	36,795

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue Net
Revenue with related parties	$ 4.6	$ 5.1	$ 13.7	$ 9.2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 23,977	$ 19,305	$ 70,630	$ 50,424
Other comprehensive income
Foreign currency translation adjustments, net of taxes	(1,286)	(64)	(1,146)	(1,445)
Comprehensive income	$ 22,691	$ 19,241	$ 69,484	$ 48,979

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Impact to Retained Earnings from adoption \| ASU 2014-09	$ 5,730				$ 5,730
Balance	509,260	$ 355	$ (6,030)	$ 630,341	(114,672)	$ (734)
Balance at Dec. 31, 2017	503,530	355	(6,030)	630,341	(120,402)	(734)
Net income	14,551				14,551
Foreign currency translation	629					629
Stock-based compensation expense	1,467			1,467
Stock options exercised	566			566
Balance at Mar. 31, 2018	526,473	355	(6,030)	632,374	(100,121)	(105)
Balance at Dec. 31, 2017	503,530	355	(6,030)	630,341	(120,402)	(734)
Net income	50,424
Foreign currency translation	(1,445)
Balance at Sep. 30, 2018	564,435	356	(6,030)	636,536	(64,248)	(2,179)
Balance at Mar. 31, 2018	526,473	355	(6,030)	632,374	(100,121)	(105)
Net income	16,568				16,568
Foreign currency translation	(2,010)					(2,010)
Stock-based compensation expense	1,487			1,487
Stock options exercised	609	1		608
Balance at Jun. 30, 2018	543,127	356	(6,030)	634,469	(83,553)	(2,115)
Net income	19,305				19,305
Foreign currency translation	(64)					(64)
Stock-based compensation expense	1,432			1,432
Stock options exercised	635			635
Balance at Sep. 30, 2018	564,435	356	(6,030)	636,536	(64,248)	(2,179)
Impact to Retained Earnings from adoption \| ASU 2016-02	9,153				9,153
Balance	598,856	356	(6,030)	639,381	(32,334)	(2,517)
Balance at Dec. 31, 2018	589,703	356	(6,030)	639,381	(41,487)	(2,517)
Net income	19,198				19,198
Foreign currency translation	(274)					(274)
Stock-based compensation expense	3,183			3,183
Stock options exercised	934	1		933
Balance at Mar. 31, 2019	621,897	357	(6,030)	643,497	(13,136)	(2,791)
Balance at Dec. 31, 2018	589,703	356	(6,030)	639,381	(41,487)	(2,517)
Net income	70,630
Foreign currency translation	(1,146)
Balance at Sep. 30, 2019	692,007	360	(6,030)	663,044	38,296	(3,663)
Balance at Mar. 31, 2019	621,897	357	(6,030)	643,497	(13,136)	(2,791)
Net income	27,455				27,455
Foreign currency translation	414					414
Stock-based compensation expense	5,385			5,385
Stock options exercised	2,904	2		2,902
Balance at Jun. 30, 2019	658,055	359	(6,030)	651,784	14,319	(2,377)
Net income	23,977				23,977
Foreign currency translation	(1,286)					(1,286)
Stock-based compensation expense	9,466			9,466
Stock options exercised	1,795	1		1,794
Balance at Sep. 30, 2019	$ 692,007	$ 360	$ (6,030)	$ 663,044	$ 38,296	$ (3,663)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 70,630	$ 50,424
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,035	6,883
Amortization	11,834	22,171
Stock-based compensation expense	18,034	4,386
Amortization of debt issuance costs and discount	954	471
Noncash lease expense	7,212	0
Deferred income tax provision	2,839	7,260
Amortization and adjustment of deferred credit	(601)	(7,515)
Other	1,768	487
Changes in assets and liabilities:
Accounts receivable and unbilled, net	(5,982)	(12,845)
Prepaid expenses and other current assets	(9,039)	(2,542)
Accounts payable	2,818	(1,323)
Accrued expenses	15,427	21,613
Advanced billings	21,901	28,277
Lease liabilities	(6,477)	0
Other assets and liabilities, net	7,574	(605)
Net cash provided by operating activities	144,927	117,142
CASH FLOWS FROM INVESTING ACTIVITIES:
Property and equipment expenditures	(12,152)	(12,575)
Other	(1,262)	(186)
Net cash used in investing activities	(13,414)	(12,761)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from stock option exercises	5,686	1,810
Payment of debt	(80,438)	(38,156)
Payments on revolving loan	0	(70,000)
Payment of deemed landlord liability	0	(1,387)
Net cash used in financing activities	(74,752)	(107,733)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(753)	(889)
INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	56,008	(4,241)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period	23,282	26,492
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period	$ 79,290	$ 22,251

Basis of Presentation

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

(1) Basis of Presentation

Description of Business

The Company’s operations are principally based in North America, Europe, and Asia.

Unaudited Interim Financial Information

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

(2) Summary of Significant Accounting Policies

Lease Recognition

Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option as determined at lease commencement.

Many of our lease agreements have both lease and non-lease components, which the Company has elected to treat as a single lease component for recognition purposes.

Recently Adopted Accounting Standards

The impact of the adoption of ASC 842 as of January 1, 2019 is as follows:

ASSETS	As of
	January 1, 2019			Adjustments			December 31, 2018
Current assets:
Prepaid expenses and other current assets		21,013			(370	)		21,383
Total current assets		177,744			(370	)		178,114
Property and equipment, net		37,613			(14,642	)		52,255
Operating lease right-of-use assets		51,854			51,854			-
Total assets	$	1,004,775		$	36,842		$	967,933
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Other current liabilities		10,951			6,090			4,861
Total current liabilities		263,116			6,090			257,026
Operating lease liabilities		45,294			45,294			-
Deemed landlord liability, less current portion		-			(24,484	)		24,484
Deferred income tax liability		3,158			2,719			439
Other long-term liabilities		14,630			(1,930	)		16,560
Total liabilities		405,919			27,689			378,230
Shareholders’ equity:
Accumulated deficit		(32,334	)		9,153			(41,487	)
Total shareholders’ equity		598,856			9,153			589,703
Total liabilities and shareholders’ equity	$	1,004,775		$	36,842		$	967,933

Net Income Per Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Net Income Per Share

(3) Net Income Per Share

The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2019 and 2018 (in thousands, except for earnings per share):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Weighted-average shares:
Common shares outstanding		35,939		35,569		35,829		35,525
RSAs		98		141		101		144
Total weighted-average shares		36,037		35,710		35,930		35,669
Earnings per common share—Basic
Net income	$	23,977	$	19,305	$	70,630	$	50,424
Less: Undistributed earnings allocated to RSAs		65		76		199		204
Net income available to common shareholders—Basic	$	23,912	$	19,229	$	70,431	$	50,220

Net income per common share—Basic	$	0.67	$	0.54	$	1.97	$	1.41

Basic weighted-average common shares outstanding		35,939		35,569		35,829		35,525
Effect of diluted shares		1,896		1,556		1,678		1,270
Diluted weighted-average shares outstanding		37,835		37,125		37,507		36,795

Net income per common share—Diluted	$	0.63	$	0.52	$	1.88	$	1.36

Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

(4) Fair Value Measurements

Level 1: Valuations based on quoted prices in active markets for identical assets or liabilities.

Level 2: Valuations based on directly observable inputs or unobservable inputs corroborated by market data.

- Definition

+ References + Details

Contract Assets and Contract Liabilities

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Contract Assets and Contract Liabilities

(5) Contract Assets and Contract Liabilities

Contract assets and liabilities are reflected in the Company’s condensed consolidated balance sheets within the accounts reflected below.

Contract Assets

Accounts receivable and unbilled, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Accounts receivable	$	113,931		$	85,120
Unbilled receivables		26,987			49,361
Less: allowance for doubtful accounts		(729	)		(1,032	)
Total accounts receivable and unbilled, net	$	140,189		$	133,449

Unbilled receivables decreased from $49.4 million at December 31, 2018 to $27.0 million at September 30, 2019. The decrease is primarily driven by increased customer invoicing.

Contract Liabilities

Advanced billings represents cash received from customers, or billed amounts per an agreed upon payment schedule, in advance of services being performed or revenue being recognized.

Advanced billings consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Advanced billings	$	169,529	$	147,935

On September 30, 2019, we had approximately $1.36 billion of performance obligations remaining to be performed for active projects.

Intangible Assets, Net

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

(6) Intangible Assets, Net

Intangible assets, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Intangible assets:
Finite-lived intangible assets:
Carrying amount:
Backlog	$	72,630		$	72,630
Customer relationships		145,051			145,051
Developed technologies		54,475			54,475
Other		3,074			3,074
Total finite-lived intangible assets		275,230			275,230
Accumulated amortization:
Backlog		(72,630	)		(72,630	)
Customer relationships		(119,478	)		(110,636	)
Developed technologies		(54,475	)		(51,751	)
Other		(2,948	)		(2,680	)
Total accumulated amortization		(249,531	)		(237,697	)
Total finite-lived intangible assets, net		25,699			37,533
Trade name (indefinite-lived)		31,646			31,646
Total intangible assets, net	$	57,345		$	69,179

As of September 30, 2019, estimated amortization expense of the Company’s intangible assets for each of the next five years and thereafter is as follows (in thousands):

	Amortization
Remainder of 2019	$	2,995
2020		7,876
2021		5,114
2022		3,353
2023		2,199
Later years		4,162
	$	25,699

Accrued Expenses

9 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Accrued Expenses

(7) Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Employee compensation and benefits	$	31,458	$	31,344
Project related reimbursable expenses		63,799		51,109
Other		7,278		5,040
Total accrued expenses	$	102,535	$	87,493

Debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Debt

(8) Debt

Debt consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Term loan	$	-	$	80,438
Less unamortized discount		-		(282	)
Less unamortized term loan debt issuance costs		-		(435	)
Long-term debt, net, less current portion	$	-	$	79,721

Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

(9) Leases

The components of lease expense as of September 30, 2019 were as follows (in thousands):

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	3,241	$	9,578
Variable lease cost		649		1,995

Supplemental cash flow information for the nine months ended September 30, 2019 related to the leases was as follows (in thousands):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	6,979

Right-of-use assets obtained in exchange for lease obligations:
Operating leases		8,476

Supplemental balance sheet information as of September 30, 2019 related to the leases was as follows (in thousands):

	As of September 30, 2019
Operating lease right-of-use assets	$	52,479

Other current liabilities	$	10,249
Operating lease liabilities		46,022
Total operating lease liabilities	$	56,271

Weighted Average Remaining Lease Term (years)
Operating leases	6.6
Weighted Average Discount Rate
Operating leases		6.1	%

Lease payments due related to lease liabilities as of September 30, 2019 were as follows (in thousands):

	Operating Leases
Remainder of 2019	$	3,151
2020		12,416
2021		12,142
2022		9,644
2023		7,378
Later years		24,411
Total lease payments		69,142
Less: imputed interest		(12,871	)
Total	$	56,271

Comparative period disclosures under ASC 840:

Rental expense under operating leases totaled $2.3 million and $6.9 million for the three and nine months ended September 30, 2018, respectively.

Future minimum rental payments for lease obligations with initial terms in excess of one year as of December 31, 2018 are as follows (in thousands):

			Non-Related		Total
	Related Party		Parties Operating		Operating
	Operating Lease		Leases		Leases
2019	$	1,987	$	6,186	$	8,173
2020		6,843		6,617		13,460
2021		6,964		5,873		12,837
2022		6,757		3,694		10,451
2023		5,229		3,257		8,486
Thereafter		103,870		5,752		109,622
Total minimum lease payments	$	131,650	$	31,379	$	163,029

Minimum annual payments required in conjunction with the Deemed landlord liabilities as of December 31, 2018 are as follows (in thousands):

	Related Party				Total
	Minimum Lease		Less:		Principal
	Payments		Interest		Amounts Due
2019	$	3,918	$	1,818	$	2,100
2020		3,988		1,662		2,326
2021		4,039		1,490		2,549
2022		4,092		1,301		2,791
2023		4,145		1,095		3,050
Thereafter		15,697		1,929		13,768
Total	$	35,879	$	9,295	$	26,584

Shareholder's Equity and Stock-Based Compensation

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Shareholder's Equity and Stock-Based Compensation

(10) Shareholder’s Equity and Stock-Based Compensation

Award Activity

The following table sets forth the Company’s stock option activity:

	Nine Months Ended September 30, 2019
				Weighted Average
	Stock Options			Exercise Price
Outstanding - beginning of period		2,945,040		$	24.18
Granted		856,939		$	54.90
Exercised		(345,815	)	$	16.28
Forfeited/Expired		(347,921	)	$	19.29
Outstanding - end of period		3,108,243		$	34.08

Exercisable - end of period		1,446,664		$	38.15

The following table sets forth the Company’s RSA/RSU activity:

	Nine Months Ended
	September 30, 2019
	Shares/Units
Outstanding and unvested - beginning of period		421,200
Granted		190,310
Vested		-
Forfeited		(66,040	)
Outstanding and unvested - end of period		545,470

Cumulative vested shares - end of period		1,913,916

Stock-based compensation expense recognized in the condensed consolidated statements of operations related to all outstanding stock based compensation awards is summarized below (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Total direct costs	$	1,807	$	875	$	5,085	$	2,619
Selling, general and administrative		7,659		557		12,949		1,767
Total stock-based compensation expense	$	9,466	$	1,432	$	18,034	$	4,386

Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

(11) Income Taxes

Commitments and Contingencies

9 Months Ended

Sep. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

(12) Commitments and Contingencies

Legal Proceedings

Purchase Commitments

Related Party Transactions

9 Months Ended

Sep. 30, 2019

Related Party Transactions

(13) Related Party Transactions

Employee Loans

Service Agreements

Cymabay Therapeutics, Inc. (“Cymabay”)

LIB Therapeutics LLC and subsidiaries (“LIB”)

CinRX Pharma and subsidiaries (“CinRx”)

The Summit, a Dolce Hotel (“The Summit”)

Medpace Investors, LLC (“MPI”)

Leased Real Estate

Headquarters Lease

ASC 842 – Operating Leases

ASC 840 – Deemed Assets and Deemed Landlord Liabilities

Travel Services

Entity Wide Disclosures

9 Months Ended

Sep. 30, 2019

Entity Wide Disclosures [Abstract]

Entity Wide Disclosures

(14) Entity Wide Disclosures

Revenue by Category

The following table disaggregates our revenue by major source (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Therapeutic Area
Oncology	$	65,529	$	48,947	$	186,152	$	135,824
Other		53,484		42,200		158,676		114,852
Metabolic		34,919		30,037		102,287		90,748
AVAI		24,243		21,947		66,831		59,497
Cardiology		21,733		22,227		68,792		71,262
Central Nervous System		16,330		13,895		48,345		40,291
Total revenue	$	216,238	$	179,253	$	631,083	$	512,474

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Unaudited Interim Financial Information

Lease Recognition

Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option as determined at lease commencement.

Many of our lease agreements have both lease and non-lease components, which the Company has elected to treat as a single lease component for recognition purposes.

Recently Adopted Accounting Standards

The impact of the adoption of ASC 842 as of January 1, 2019 is as follows:

ASSETS	As of
	January 1, 2019			Adjustments			December 31, 2018
Current assets:
Prepaid expenses and other current assets		21,013			(370	)		21,383
Total current assets		177,744			(370	)		178,114
Property and equipment, net		37,613			(14,642	)		52,255
Operating lease right-of-use assets		51,854			51,854			-
Total assets	$	1,004,775		$	36,842		$	967,933
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Other current liabilities		10,951			6,090			4,861
Total current liabilities		263,116			6,090			257,026
Operating lease liabilities		45,294			45,294			-
Deemed landlord liability, less current portion		-			(24,484	)		24,484
Deferred income tax liability		3,158			2,719			439
Other long-term liabilities		14,630			(1,930	)		16,560
Total liabilities		405,919			27,689			378,230
Shareholders’ equity:
Accumulated deficit		(32,334	)		9,153			(41,487	)
Total shareholders’ equity		598,856			9,153			589,703
Total liabilities and shareholders’ equity	$	1,004,775		$	36,842		$	967,933

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2019

ASU 2016-02

Summary of Impact of Adoption of Accounting Standards

The impact of the adoption of ASC 842 as of January 1, 2019 is as follows:

ASSETS	As of
	January 1, 2019			Adjustments			December 31, 2018
Current assets:
Prepaid expenses and other current assets		21,013			(370	)		21,383
Total current assets		177,744			(370	)		178,114
Property and equipment, net		37,613			(14,642	)		52,255
Operating lease right-of-use assets		51,854			51,854			-
Total assets	$	1,004,775		$	36,842		$	967,933
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Other current liabilities		10,951			6,090			4,861
Total current liabilities		263,116			6,090			257,026
Operating lease liabilities		45,294			45,294			-
Deemed landlord liability, less current portion		-			(24,484	)		24,484
Deferred income tax liability		3,158			2,719			439
Other long-term liabilities		14,630			(1,930	)		16,560
Total liabilities		405,919			27,689			378,230
Shareholders’ equity:
Accumulated deficit		(32,334	)		9,153			(41,487	)
Total shareholders’ equity		598,856			9,153			589,703
Total liabilities and shareholders’ equity	$	1,004,775		$	36,842		$	967,933

Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Reconciliation of Denominators and Additional Shares that are Excluded from the Calculation of EPS

The following table sets forth the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2019 and 2018 (in thousands, except for earnings per share):


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Weighted-average shares:
Common shares outstanding		35,939		35,569		35,829		35,525
RSAs		98		141		101		144
Total weighted-average shares		36,037		35,710		35,930		35,669
Earnings per common share—Basic
Net income	$	23,977	$	19,305	$	70,630	$	50,424
Less: Undistributed earnings allocated to RSAs		65		76		199		204
Net income available to common shareholders—Basic	$	23,912	$	19,229	$	70,431	$	50,220

Net income per common share—Basic	$	0.67	$	0.54	$	1.97	$	1.41

Basic weighted-average common shares outstanding		35,939		35,569		35,829		35,525
Effect of diluted shares		1,896		1,556		1,678		1,270
Diluted weighted-average shares outstanding		37,835		37,125		37,507		36,795

Net income per common share—Diluted	$	0.63	$	0.52	$	1.88	$	1.36

Contract Assets and Contract Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Summary of Company's Contract Asset and Contract Liability

Accounts receivable and unbilled, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Accounts receivable	$	113,931		$	85,120
Unbilled receivables		26,987			49,361
Less: allowance for doubtful accounts		(729	)		(1,032	)
Total accounts receivable and unbilled, net	$	140,189		$	133,449

Advanced billings consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Advanced billings	$	169,529	$	147,935

Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets, Net

Intangible assets, net consisted of the following (in thousands):

	As of
	September 30,			December 31,
	2019			2018
Intangible assets:
Finite-lived intangible assets:
Carrying amount:
Backlog	$	72,630		$	72,630
Customer relationships		145,051			145,051
Developed technologies		54,475			54,475
Other		3,074			3,074
Total finite-lived intangible assets		275,230			275,230
Accumulated amortization:
Backlog		(72,630	)		(72,630	)
Customer relationships		(119,478	)		(110,636	)
Developed technologies		(54,475	)		(51,751	)
Other		(2,948	)		(2,680	)
Total accumulated amortization		(249,531	)		(237,697	)
Total finite-lived intangible assets, net		25,699			37,533
Trade name (indefinite-lived)		31,646			31,646
Total intangible assets, net	$	57,345		$	69,179

Schedule of Estimated Amortization Expense of Intangible Assets

As of September 30, 2019, estimated amortization expense of the Company’s intangible assets for each of the next five years and thereafter is as follows (in thousands):

	Amortization
Remainder of 2019	$	2,995
2020		7,876
2021		5,114
2022		3,353
2023		2,199
Later years		4,162
	$	25,699

Accrued Expenses (Tables)

9 Months Ended

Sep. 30, 2019

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Employee compensation and benefits	$	31,458	$	31,344
Project related reimbursable expenses		63,799		51,109
Other		7,278		5,040
Total accrued expenses	$	102,535	$	87,493

Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Debt

Debt consisted of the following (in thousands):

	As of
	September 30,		December 31,
	2019		2018
Term loan	$	-	$	80,438
Less unamortized discount		-		(282	)
Less unamortized term loan debt issuance costs		-		(435	)
Long-term debt, net, less current portion	$	-	$	79,721

- Definition

+ References

+ Details

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Summary of Components of Lease Expense

The components of lease expense as of September 30, 2019 were as follows (in thousands):

	Three Months Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	3,241	$	9,578
Variable lease cost		649		1,995

Summary of Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information for the nine months ended September 30, 2019 related to the leases was as follows (in thousands):

	Nine Months Ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	6,979

Right-of-use assets obtained in exchange for lease obligations:
Operating leases		8,476

Summary of Supplemental Balance Sheet Information Related to Leases

Supplemental balance sheet information as of September 30, 2019 related to the leases was as follows (in thousands):

	As of September 30, 2019
Operating lease right-of-use assets	$	52,479

Other current liabilities	$	10,249
Operating lease liabilities		46,022
Total operating lease liabilities	$	56,271

Weighted Average Remaining Lease Term (years)
Operating leases	6.6
Weighted Average Discount Rate
Operating leases		6.1	%

Schedule of Lease Payments Due Related To Lease Liabilities

Lease payments due related to lease liabilities as of September 30, 2019 were as follows (in thousands):

	Operating Leases
Remainder of 2019	$	3,151
2020		12,416
2021		12,142
2022		9,644
2023		7,378
Later years		24,411
Total lease payments		69,142
Less: imputed interest		(12,871	)
Total	$	56,271

Schedule of Future Minimum Rental Payments for Lease Obligations under ASC 840

Future minimum rental payments for lease obligations with initial terms in excess of one year as of December 31, 2018 are as follows (in thousands):

			Non-Related		Total
	Related Party		Parties Operating		Operating
	Operating Lease		Leases		Leases
2019	$	1,987	$	6,186	$	8,173
2020		6,843		6,617		13,460
2021		6,964		5,873		12,837
2022		6,757		3,694		10,451
2023		5,229		3,257		8,486
Thereafter		103,870		5,752		109,622
Total minimum lease payments	$	131,650	$	31,379	$	163,029

Schedule of Minimum Annual Payments Required in Conjunction with Landlord Liability under ASC 840

Minimum annual payments required in conjunction with the Deemed landlord liabilities as of December 31, 2018 are as follows (in thousands):

	Related Party				Total
	Minimum Lease		Less:		Principal
	Payments		Interest		Amounts Due
2019	$	3,918	$	1,818	$	2,100
2020		3,988		1,662		2,326
2021		4,039		1,490		2,549
2022		4,092		1,301		2,791
2023		4,145		1,095		3,050
Thereafter		15,697		1,929		13,768
Total	$	35,879	$	9,295	$	26,584

Shareholder's Equity and Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of Stock Option Activity

The following table sets forth the Company’s stock option activity:

	Nine Months Ended September 30, 2019
				Weighted Average
	Stock Options			Exercise Price
Outstanding - beginning of period		2,945,040		$	24.18
Granted		856,939		$	54.90
Exercised		(345,815	)	$	16.28
Forfeited/Expired		(347,921	)	$	19.29
Outstanding - end of period		3,108,243		$	34.08

Exercisable - end of period		1,446,664		$	38.15

Schedule of RSA/RSU Activity

The following table sets forth the Company’s RSA/RSU activity:

	Nine Months Ended
	September 30, 2019
	Shares/Units
Outstanding and unvested - beginning of period		421,200
Granted		190,310
Vested		-
Forfeited		(66,040	)
Outstanding and unvested - end of period		545,470

Cumulative vested shares - end of period		1,913,916

Summary of Stock-Based Compensation Expense Recognized in Statements of Operations Related to All Outstanding Stock Based Compensation Awards

Stock-based compensation expense recognized in the condensed consolidated statements of operations related to all outstanding stock based compensation awards is summarized below (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Total direct costs	$	1,807	$	875	$	5,085	$	2,619
Selling, general and administrative		7,659		557		12,949		1,767
Total stock-based compensation expense	$	9,466	$	1,432	$	18,034	$	4,386

Entity Wide Disclosures (Tables)

9 Months Ended

Sep. 30, 2019

Entity Wide Disclosures [Abstract]

Summary of Revenue by Major Source

The following table disaggregates our revenue by major source (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Therapeutic Area
Oncology	$	65,529	$	48,947	$	186,152	$	135,824
Other		53,484		42,200		158,676		114,852
Metabolic		34,919		30,037		102,287		90,748
AVAI		24,243		21,947		66,831		59,497
Cardiology		21,733		22,227		68,792		71,262
Central Nervous System		16,330		13,895		48,345		40,291
Total revenue	$	216,238	$	179,253	$	631,083	$	512,474

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	$ 38,296	$ (41,487)
Accounts receivable and unbilled, net	140,189	133,449
Deferred income tax liability	5,578	439
Accrued expenses	102,535	87,493
Advanced billings	$ 169,529	$ 147,935
ASU 2014-09 \| Impact of Adoption of ASC 606 - Adjustments
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit			$ 5,700
Accounts receivable and unbilled, net			23,900
Deferred income tax liability			(1,600)
Accrued expenses			35,100
Pre-funded study costs			(57,400)
Advanced billings			$ 38,900

Summary of Significant Accounting Policies - Summary of Impact of Adoption of Accounting Standards (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Prepaid expenses and other current assets	$ 30,918				$ 21,383
Total current assets	250,397				178,114
Property and equipment, net	43,715				52,255
Operating lease right-of-use assets	52,479				0
Total assets	1,072,329				967,933
Current liabilities:
Other current liabilities	21,644				4,861
Total current liabilities	314,392				257,026
Operating lease liabilities	46,022				0
Deemed landlord liability, less current portion	0				24,484
Deferred income tax liability	5,578				439
Other long-term liabilities	14,330				16,560
Total liabilities	380,322				378,230
Shareholders’ equity:
Accumulated deficit	38,296				(41,487)
Total shareholders’ equity	692,007	$ 658,055	$ 621,897		589,703	$ 564,435	$ 543,127	$ 526,473	$ 503,530
Total liabilities and shareholders’ equity	$ 1,072,329				$ 967,933
ASU 2016-02
Current assets:
Prepaid expenses and other current assets				$ 21,013
Total current assets				177,744
Property and equipment, net				37,613
Operating lease right-of-use assets				51,854
Total assets				1,004,775
Current liabilities:
Other current liabilities				10,951
Total current liabilities				263,116
Operating lease liabilities				45,294
Deemed landlord liability, less current portion				0
Deferred income tax liability				3,158
Other long-term liabilities				14,630
Total liabilities				405,919
Shareholders’ equity:
Accumulated deficit				(32,334)
Total shareholders’ equity				598,856
Total liabilities and shareholders’ equity				1,004,775
ASU 2016-02 \| Adjustments
Current assets:
Prepaid expenses and other current assets				(370)
Total current assets				(370)
Property and equipment, net				(14,642)
Operating lease right-of-use assets				51,854
Total assets				36,842
Current liabilities:
Other current liabilities				6,090
Total current liabilities				6,090
Operating lease liabilities				45,294
Deemed landlord liability, less current portion				(24,484)
Deferred income tax liability				2,719
Other long-term liabilities				(1,930)
Total liabilities				27,689
Shareholders’ equity:
Accumulated deficit				9,153
Total shareholders’ equity				9,153
Total liabilities and shareholders’ equity				$ 36,842

Net Income Per Share - Schedule of Reconciliation of Denominators and Additional Shares that are Excluded from the Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Weighted-average shares:
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525
Total weighted-average shares	36,037			35,710			35,930	35,669
Earnings per common share—Basic
Net income	$ 23,977	$ 27,455	$ 19,198	$ 19,305	$ 16,568	$ 14,551	$ 70,630	$ 50,424
Net income available to common shareholders—Basic	$ 23,912			$ 19,229			$ 70,431	$ 50,220
Net income per common share—Basic	$ 0.67			$ 0.54			$ 1.97	$ 1.41
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525
Effect of diluted shares	1,896			1,556			1,678	1,270
Diluted weighted-average shares outstanding	37,835			37,125			37,507	36,795
Net income per common share—Diluted	$ 0.63			$ 0.52			$ 1.88	$ 1.36
RSAs
Weighted-average shares:
Basic weighted-average common shares outstanding	98			141			101	144
Earnings per common share—Basic
Less: Undistributed earnings allocated to RSAs	$ 65			$ 76			$ 199	$ 204
Basic weighted-average common shares outstanding	98			141			101	144
Common Stock
Weighted-average shares:
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525
Earnings per common share—Basic
Basic weighted-average common shares outstanding	35,939			35,569			35,829	35,525

Net Income Per Share - Additional Information (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted EPS	245,000	13,420	245,000	13,420

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair value measurements transfers between level 1, level 2 or level 3	$ 0	$ 0	$ 0	$ 0

Contract Assets and Contract Liabilities - Summary of Accounts Receivable and Unbilled, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Accounts receivable	$ 113,931	$ 85,120
Unbilled receivables	26,987	49,361
Less: allowance for doubtful accounts	(729)	(1,032)
Total accounts receivable and unbilled, net	$ 140,189	$ 133,449

Contract Assets and Contract Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Unbilled receivables	$ 26,987	$ 49,361
Advanced billings	169,529	$ 147,935
Performance obligations remaining to be performed	$ 1,360,000

Contract Assets and Contract Liabilities - Summary of Advanced Billings (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Revenue From Contract With Customer [Abstract]
Advanced billings	$ 169,529	$ 147,935

Intangible Assets, Net - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-lived intangible assets:
Total finite-lived intangible assets	$ 275,230	$ 275,230
Accumulated amortization:
Total accumulated amortization	(249,531)	(237,697)
Total finite-lived intangible assets, net	25,699	37,533
Trade name (indefinite-lived)	31,646	31,646
Total intangible assets, net	57,345	69,179
Backlog
Finite-lived intangible assets:
Total finite-lived intangible assets	72,630	72,630
Accumulated amortization:
Total accumulated amortization	(72,630)	(72,630)
Customer Relationships
Finite-lived intangible assets:
Total finite-lived intangible assets	145,051	145,051
Accumulated amortization:
Total accumulated amortization	(119,478)	(110,636)
Developed Technologies
Finite-lived intangible assets:
Total finite-lived intangible assets	54,475	54,475
Accumulated amortization:
Total accumulated amortization	(54,475)	(51,751)
Other
Finite-lived intangible assets:
Total finite-lived intangible assets	3,074	3,074
Accumulated amortization:
Total accumulated amortization	$ (2,948)	$ (2,680)

Intangible Assets, Net - Schedule of Estimated Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 2,995
2020	7,876
2021	5,114
2022	3,353
2023	2,199
Later years	4,162
Total finite-lived intangible assets, net	$ 25,699	$ 37,533

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accrued Liabilities And Other Liabilities [Abstract]
Employee compensation and benefits	$ 31,458	$ 31,344
Project related reimbursable expenses	63,799	51,109
Other	7,278	5,040
Total accrued expenses	$ 102,535	$ 87,493

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less unamortized discount	$ 0	$ (282)
Long-term debt, net, less current portion	0	79,721
Term loan
Debt Instrument [Line Items]
Debt	0	80,438
Less unamortized term loan debt issuance costs	$ 0	$ (435)

Debt - Additional Information (Details) - USD ($)		3 Months Ended
Debt - Additional Information (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2019	Jun. 30, 2019
Credit Facility
Debt Instrument [Line Items]
Outstanding borrowings	$ 0	$ 0
Outstanding letters of credit	200,000	200,000
Maximum \| Credit Facility
Debt Instrument [Line Items]
Debt instrument, principal amount	50,000,000.0	50,000,000.0
Senior Secured Credit Agreement \| Senior Secured Term Loan Facility \| Selling, General and Administrative Expenses
Debt Instrument [Line Items]
Unamortized term loan issuance fees			$ 300,000
Senior Secured Credit Agreement \| Senior Secured Term Loan Facility \| Interest Expense, Net
Debt Instrument [Line Items]
Amortization of debt discount			$ 200,000
Loan Agreement \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Unamortized term loan issuance fees	0	0
Drawn amount	0
Accrued commitment fees	$ 100,000
Amortized loan issuance fees		700,000
Loan Agreement \| Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis points	1.00%
Debt instrument, term	364 days
Loan Agreement \| Selling, General and Administrative Expenses \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Amortized loan issuance fees		500,000
Loan Agreement \| Interest Expense, Net \| Senior Secured Credit Agreement
Debt Instrument [Line Items]
Amortized loan issuance fees		$ 200,000

Leases - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Leases - Additional Information (Details) $ in Millions	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Option	Sep. 30, 2018 USD ($)
Lessee Lease Description [Line Items]
Rent expense under ASC 840	$ 2.3		$ 6.9
Real Estate and Equipment
Lessee Lease Description [Line Items]
Lease renewal term, operating lease		20 years
Description of option to extend the lease		Many of the Company’s leases include options to extend the leases on a month to month basis or for set periods for up to 20 years.
Operating lease, existense of option to extend		true
Description of option to terminate the lease		Many leases also include options to terminate the leases within 1 year or per other contractual terms.
Lessee, operating lease, existence of option to terminate		true
Real Estate and Equipment \| Minimum
Lessee Lease Description [Line Items]
Remaining lease term, operating lease		1 year
Real Estate and Equipment \| Maximum
Lessee Lease Description [Line Items]
Remaining lease term, operating lease		20 years
Operating lease, options to terminate lease term		1 year
Corporate Offices
Lessee Lease Description [Line Items]
Initial term of operating lease not yet commenced		20 years
Lease not yet commenced, option to extend		true
Lease not yet commenced, option to extend description		renewal option for two 10-year terms at prevailing market rates.
Operating lease not yet commenced, renewal term		10 years
Operating lease not yet commenced, number of renewal option \| Option		2
Operating lease not yet commenced, future payments		$ 124.0

Leases - Summary of Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease Cost [Abstract]
Operating lease cost	$ 3,241	$ 9,578
Variable lease cost	$ 649	$ 1,995

Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 6,979
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 8,476

Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets And Liabilities Lessee [Abstract]
Operating lease right-of-use assets	$ 52,479	$ 0
Other current liabilities	$ 10,249
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities	$ 46,022	$ 0
Total operating lease liabilities	$ 56,271
Weighted Average Remaining Lease Term (years)
Operating leases	6 years 7 months 6 days
Weighted Average Discount Rate
Operating leases	6.10%

Leases - Schedule of Lease Payments Due Related To Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Lease Liabilities Payments Due [Abstract]
Remainder of 2019	$ 3,151
2020	12,416
2021	12,142
2022	9,644
2023	7,378
Later years	24,411
Total lease payments	69,142
Less: imputed interest	(12,871)
Total	$ 56,271

Leases - Schedule of Future Minimum Rental Payments for Lease Obligations under ASC 840 (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, 2019	$ 8,173
Operating Leases, 2020	13,460
Operating Leases, 2021	12,837
Operating Leases, 2022	10,451
Operating Leases, 2023	8,486
Operating Leases, Thereafter	109,622
Operating Leases, Total minimum lease payments	163,029
Related Party
Operating Leased Assets [Line Items]
Operating Leases, 2019	1,987
Operating Leases, 2020	6,843
Operating Leases, 2021	6,964
Operating Leases, 2022	6,757
Operating Leases, 2023	5,229
Operating Leases, Thereafter	103,870
Operating Leases, Total minimum lease payments	131,650
Non-Related Party
Operating Leased Assets [Line Items]
Operating Leases, 2019	6,186
Operating Leases, 2020	6,617
Operating Leases, 2021	5,873
Operating Leases, 2022	3,694
Operating Leases, 2023	3,257
Operating Leases, Thereafter	5,752
Operating Leases, Total minimum lease payments	$ 31,379

Leases - Schedule of Minimum Annual Payments Required in Conjunction with Landlord Liability under ASC 840 (Details) - Deemed Landlord Liabilities $ in Thousands	Dec. 31, 2018 USD ($)
Schedule Of Capital Leased Assets [Line Items]
Related Party Minimum Lease Payments, 2019	$ 3,918
Related Party Minimum Lease Payments, 2020	3,988
Related Party Minimum Lease Payments, 2021	4,039
Related Party Minimum Lease Payments, 2022	4,092
Related Party Minimum Lease Payments, 2023	4,145
Related Party Minimum Lease Payments, Thereafter	15,697
Related Party Minimum Lease Payments, Total	35,879
Related Party Minimum Lease Payments, Interest, 2019	1,818
Related Party Minimum Lease Payments, Interest, 2020	1,662
Related Party Minimum Lease Payments, Interest, 2021	1,490
Related Party Minimum Lease Payments, Interest, 2022	1,301
Related Party Minimum Lease Payments, Interest, 2023	1,095
Related Party Minimum Lease Payments, Interest, Thereafter	1,929
Related Party Minimum Lease Payments, Interest, Total	9,295
Total Principal Amounts Due, 2019	2,100
Total Principal Amounts Due, 2020	2,326
Total Principal Amounts Due, 2021	2,549
Total Principal Amounts Due, 2022	2,791
Total Principal Amounts Due, 2023	3,050
Total Principal Amounts Due, Thereafter	13,768
Total Principal Amounts Due, Total	$ 26,584

Shareholder's Equity and Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		856,939
2016 Incentive Award Plan \| Granted to Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees		778,986	722,200
2016 Incentive Award Plan \| Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted			33,801
2016 Incentive Award Plan \| Vesting After Four Years \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		10,000	443,000
Award vesting period		4 years	4 years
2016 Incentive Award Plan \| Vesting After Four Years \| Restricted Stock Units (RSU)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period		4 years	4 years
Shares granted		190,310	279,200
2016 Incentive Award Plan \| Vesting After One Year
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		5,000
Award vesting period		1 year
2016 Incentive Award Plan \| Vesting After One Year \| Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		38,832
Award vesting period		1 year
2016 Incentive Award Plan \| Fully-vested Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		551,676
2016 Incentive Award Plan \| Vesting in Twelve Equal Monthly Installments
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		22,000
2014 Incentive Award Plan \| Stock Options \| MPI \| Tender Offer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of vested options purchased by related party	229,431
2014 Incentive Award Plan \| Stock Options \| MPI \| Selling, General and Administrative Expenses \| Tender Offer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 5.1	$ 5.1

Shareholder's Equity and Stock-Based Compensation - Schedule of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Equity [Abstract]
Number of Stock Options, Outstanding - beginning of period \| shares	2,945,040
Number of Stock Options, Granted \| shares	856,939
Number of Stock Options, Exercised \| shares	(345,815)
Number of Stock Options, Forfeited/Expired \| shares	(347,921)
Number of Stock Options, Outstanding - end of period \| shares	3,108,243
Number of Stock Options, Exercisable - end of period \| shares	1,446,664
Weighted Average Exercise Price, Outstanding - beginning of Period \| $ / shares	$ 24.18
Weighted Average Exercise Price, Granted \| $ / shares	54.90
Weighted Average Exercise Price, Exercised \| $ / shares	16.28
Weighted Average Exercise Price, Forfeited/Expired \| $ / shares	19.29
Weighted Average Exercise Price, Outstanding - end of period \| $ / shares	34.08
Weighted Average Exercise Price, Exercisable - end of period \| $ / shares	$ 38.15

Shareholder's Equity and Stock-Based Compensation - Schedule of RSA/RSU Activity (Details) - RSA/RSU	9 Months Ended
	Sep. 30, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding and unvested - beginning of period	421,200
Granted	190,310
Vested	0
Forfeited	(66,040)
Outstanding and unvested - end of period	545,470
Cumulative vested shares - end of period	1,913,916

Shareholder's Equity and Stock-Based Compensation - Summary of Stock-Based Compensation Expense Recognized in Statements of Operations Related to All Outstanding Stock Based Compensation Awards (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 9,466	$ 1,432	$ 18,034	$ 4,386
Total Direct Costs
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,807	875	5,085	2,619
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 7,659	$ 557	$ 12,949	$ 1,767

Income Taxes - Additional Information (Details)	3 Months Ended		9 Months Ended
Income Taxes - Additional Information (Details)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	18.60%	24.20%	20.30%	22.00%
U.S. statutory rate	21.00%		21.00%

Commitments and Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Minimum purchase commitments for project related supplies	$ 11.1
Minimum purchase commitments, description	The Company has several minimum purchase commitments for project related supplies totaling $11.1 million. In return for the commitment, Medpace receives preferential pricing. The commitments expire at various times through 2026.

Related Party Transactions - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) RenewalOption Agreement Building	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) RenewalOption
Related Party Transaction [Line Items]
Advanced billings	$ 1,300		$ 1,300		$ 400
Accounts receivable and unbilled, net	1,100		1,100		3,800
Operating lease cost recognized	3,241		9,578
Lease expense recognized under 840		$ 2,300		$ 6,900
Deemed landlord liability, long-term portions, under ASC 840	0		0		24,484
Accounts payable due to related party	100		100		300
Prepaid Expenses and Other Current Assets \| Medpace Investors, LLC \| Tax Related Receivables
Related Party Transaction [Line Items]
Due from related party	300		300
Employee Loans \| Prepaid Expenses and Other Current Assets and Other Assets
Related Party Transaction [Line Items]
Employee advances receivables	200		200		200
Service Agreements \| Cymabay
Related Party Transaction [Line Items]
Advanced billings	500		500
Accounts receivable and unbilled, net	600		600		2,500
Service Agreements \| Cymabay \| Maximum
Related Party Transaction [Line Items]
Advanced billings					100
Service Agreements \| Cymabay \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	3,500	4,100	9,400	6,200
Service Agreements \| LIB
Related Party Transaction [Line Items]
Advanced billings	400		400		300
Accounts receivable and unbilled, net	100		100		1,000
Service Agreements \| LIB \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	500	1,000	1,500	2,800
Service Agreements \| CinRx Pharma and Subsidiaries
Related Party Transaction [Line Items]
Advanced billings	400		400		100
Accounts receivable and unbilled, net	400		400		$ 400
Service Agreements \| CinRx Pharma and Subsidiaries \| Revenue Net
Related Party Transaction [Line Items]
Revenue with related parties	500		2,800
Service Agreements \| CinRx Pharma and Subsidiaries \| Revenue Net \| Maximum
Related Party Transaction [Line Items]
Revenue with related parties		100		200
Service Agreements \| The Summit
Related Party Transaction [Line Items]
Expenses incurred	$ 200		$ 500
Leased Real Estate
Related Party Transaction [Line Items]
Number of lease renewal, option \| RenewalOption					2
Lease term upon renewal					10 years
Lease expiration year					2040
Deemed assets, term of lease under ASC 840					15 years
Related party capital lease payments under ASC 840		1,000		2,900
Deemed landlord liability, current, under ASC 840					$ 2,100
Deemed landlord liability, long-term portions, under ASC 840					24,500
Leased Real Estate \| Chief Executive Officer
Related Party Transaction [Line Items]
Term of lease	12 years		12 years
Lease expiration period			2022-11
Number of lease renewal, option \| RenewalOption			1
Lease term upon renewal	10 years		10 years
Operating lease cost recognized	$ 500		$ 1,500
Lease expense recognized under 840		500		1,600
Leased Real Estate \| Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Number of lease renewal, option \| RenewalOption			1
Lease term upon renewal	10 years		10 years
Operating lease cost recognized	$ 900		$ 2,700
Lease expiration year			2027
Number of lease agreements \| Agreement			2
Number of buildings \| Building			2
Lease occupancy year			2012
Existense of option to extend			true
Description of option to extend			Company having one 10-year option to extend the lease term
Leased Real Estate \| Property and Equipment, Net \| Building
Related Party Transaction [Line Items]
Deemed assets, net, under ASC 840					14,600
Travel Services \| Chief Executive Officer
Related Party Transaction [Line Items]
Travel expenses with related party	300	$ 400	$ 900	$ 1,000
Accounts payable due to related party	$ 100		$ 100		$ 200

Entity Wide Disclosures - Summary of Revenue by Major Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 216,238	$ 179,253	$ 631,083	$ 512,474
Oncology
Disaggregation Of Revenue [Line Items]
Total revenue	65,529	48,947	186,152	135,824
Other
Disaggregation Of Revenue [Line Items]
Total revenue	53,484	42,200	158,676	114,852
Metabolic
Disaggregation Of Revenue [Line Items]
Total revenue	34,919	30,037	102,287	90,748
AVAI
Disaggregation Of Revenue [Line Items]
Total revenue	24,243	21,947	66,831	59,497
Cardiology
Disaggregation Of Revenue [Line Items]
Total revenue	21,733	22,227	68,792	71,262
Central Nervous System
Disaggregation Of Revenue [Line Items]
Total revenue	$ 16,330	$ 13,895	$ 48,345	$ 40,291