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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 27, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	MEDP
Entity Registrant Name	Medpace Holdings, Inc.
Entity Central Index Key	0001668397
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		35,507,414

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 22,245	$ 26,485
Restricted cash	7	7
Accounts receivable and unbilled, net (includes $1.3 million and $1.0 million with related parties at March 31, 2018 and December 31, 2017, respectively)	110,654	83,079
Prepaid expenses and other current assets	20,848	20,400
Total current assets	153,754	129,971
Property and equipment, net	51,079	48,739
Goodwill	660,981	660,981
Intangible assets, net	91,349	98,740
Deferred income taxes	9,970	6,343
Other assets	5,891	5,943
Total assets	973,024	950,717
Current liabilities:
Accounts payable	17,924	16,674
Accrued expenses	63,576	23,673
Pre-funded study costs (includes $1.0 million with related parties at December 31, 2017)	0	57,406
Advanced billings (includes $0.3 million and $1.7 million with related parties at March 31, 2018 and December 31, 2017, respectively)	126,387	73,756
Current portion of long-term debt	16,500	16,500
Other current liabilities	8,105	4,697
Total current liabilities	232,492	192,706
Long-term debt, net, less current portion	181,067	205,111
Deemed landlord liability, less current portion	26,091	26,602
Deferred income tax liability	596	560
Deferred credit	11,265	11,468
Other long-term liabilities	10,440	10,740
Total liabilities	461,951	447,187
Commitments and contingencies (see Note 11)
Shareholders’ equity:
Preferred stock - $0.01 par-value; 5,000,000 shares authorized; no shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	0	0
Common stock - $0.01 par-value; 250,000,000 shares authorized at March 31, 2018 and December 31, 2017, respectively; 35,504,675 and 35,466,510 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	355	355
Treasury stock - 200,000 shares at March 31, 2018 and December 31, 2017	(6,030)	(6,030)
Additional paid-in capital	632,374	630,341
Accumulated deficit	(115,521)	(120,402)
Accumulated other comprehensive loss	(105)	(734)
Total shareholders’ equity	511,073	503,530
Total liabilities and shareholders’ equity	$ 973,024	$ 950,717

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, unbilled services with related parties	$ 1.3	$ 1.0
Pre-funded study costs with related parties		1.0
Advanced billings with related parties	$ 0.3	$ 1.7
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	35,504,675	35,466,510
Common stock shares outstanding	35,504,675	35,466,510
Treasury stock shares	200,000	200,000

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue:
Revenue, net (includes $1.5 million with related parties for the three months ended March 31, 2018)	$ 163,077	$ 0
Service revenue, net (includes $4.0 million with related parties for the three months ended March 31, 2017)	0	93,781
Reimbursed out-of-pocket revenue (includes $0.7 million with related parties for the three months ended March 31, 2017)	0	12,830
Total revenue	163,077	106,611
Operating expenses:
Direct service costs, excluding depreciation and amortization	60,341	51,105
Reimbursed out-of-pocket expenses	56,913	12,830
Total direct costs	117,254	63,935
Selling, general and administrative	15,999	15,154
Depreciation	2,314	2,130
Amortization	7,391	9,448
Total operating expenses	142,958	90,667
Income from operations	20,119	15,944
Other expense, net:
Miscellaneous expense, net	(153)	(372)
Interest expense, net	(2,309)	(1,794)
Total other expense, net	(2,462)	(2,166)
Income before income taxes	17,657	13,778
Income tax provision	3,106	5,331
Net income	$ 14,551	$ 8,447
Net income per share attributable to common shareholders:
Basic	$ 0.41	$ 0.21
Diluted	$ 0.40	$ 0.20
Weighted average common shares outstanding:
Basic	35,486	40,669
Diluted	36,449	41,508

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reimbursed out-of-pocket revenue with related parties		$ 0.7
Revenue, Net
Revenue with related parties	1.5
Service Revenue, Net
Revenue with related parties		$ 4.0

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 14,551	$ 8,447
Other comprehensive income
Foreign currency translation adjustments, net of taxes	629	596
Comprehensive income	$ 15,180	$ 9,043

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 14,551	$ 8,447
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	2,314	2,130
Amortization	7,391	9,448
Stock-based compensation expense	1,467	1,034
Amortization of debt issuance costs and discount	159	165
Deferred income tax benefit	(248)	(410)
Amortization and adjustment of deferred credit	(203)	0
Other	(32)	(252)
Changes in assets and liabilities:
Accounts receivable and unbilled, net	(17,760)	(2,292)
Prepaid expenses and other current assets	(214)	(247)
Accounts payable	699	(1,331)
Accrued expenses	5,268	(10,508)
Pre-funded study costs	0	(3,497)
Advanced billings	6,817	(5,246)
Other assets and liabilities, net	3,089	1,884
Net cash provided by (used in) operating activities	23,298	(675)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property and equipment expenditures	(3,951)	(4,374)
Other	23	16
Net cash used in investing activities	(3,928)	(4,358)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from stock option exercises	566	193
Payment of debt	(4,125)	(3,094)
Payments on revolving loan	(20,000)	0
Payment of deemed landlord liability	(451)	(404)
Net cash used in financing activities	(24,010)	(3,305)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	400	540
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(4,240)	(7,798)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period	26,492	37,407
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period	$ 22,252	$ 29,609

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2018
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, coordinated central laboratory, project management, regulatory affairs, clinical monitoring, data management and analysis, pharmacovigilance new drug application submissions, and post-marketing clinical support. The Company also provides bio-analytical 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, 2017.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2018

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, 2017. Significant changes to our accounting policies as a result of adopting Accounting Standards Codification Topic 606 (“ASC 606”) are discussed below:

Revenue Recognition

We generally enter into contracts with customers to provide services ranging in duration from a few months to several years. The contract terms generally provide for payments based on a fixed-fee or unit-of-service arrangement. We account for revenue in accordance with ASC 606, Revenue from Contracts with Customers, which we adopted on January 1, 2018. Revenue on contracts is recognized when or as we satisfy the contract performance obligations, at the amount that reflects our cumulative progress toward delivery of the performance obligation. This progress assessment is applied to the amount of consideration to which we expect to be paid for delivery of the performance obligation. Our performance obligations are generally satisfied over time and related revenue is recognized as services are provided to meet these obligations.

Contract Assumptions

An arrangement is accounted for as a contract within the scope of ASC 606 when the Company and its customers approve the contract, are committed to perform their respective obligations, each party can identify its rights regarding the goods or services to be transferred, commercial substance is present, and it is probable that the Company will collect substantially all of the consideration to which it will be entitled in exchange for the goods or services that will be transferred to the customer.

For our services to meet this criteria, contracts generally need to be written, pending regulatory hurdles required to commence work must be cleared, the study protocol must be completed, the customer must have adequate funding or reasonable path to funding to execute the contracted portion of the study, and the study must be actively moving forward. Once these criteria have been met, it is deemed that the Company and its customers are committed to perform their respective obligations. Depending on the timing of when these criteria are met, revenue recognition may vary significantly on a period over period basis.

Accounting for contracts performed over a period of time involves the use of various assumptions to estimate total contract revenue and costs. We estimate expected costs to complete a contract and recognize contracted revenue over the life of the contract as those costs are incurred.

Cost estimates are based on a detailed project budget and are developed based on many variables, including, but not limited to, the scope of the work, the complexity of the study, the participating geographic locations and the Company’s historical experience. To assist with the estimation of costs expected at completion over the life of a project, regular contract reviews are performed in which performance to date is compared to the most current estimate to complete assumptions. The reviews include an assessment of costs incurred to date compared to expectations based on budget assumptions and other circumstances specific to the project. The total estimated costs necessary to complete is updated and any revisions to the existing cost estimate results in cumulative adjustments to the amount of revenue recognized in the period in which the revisions are identified. In the case of cost estimates related to activities legally contracted as reimbursable in nature, including but not limited to investigator fee activity, these estimates also influence our assumed contract value and assumed remaining performance obligations. Because of the uncertainties inherent in estimating the costs necessary to fulfill contractual obligations, it is possible that estimates may change in the near term, resulting in a material change in revenue reported.

Contracts generally provide for pricing modifications upon scope of work changes. We recognize revenue, at an amount to which we expect to be entitled, related to work performed in connection with scope changes when the underlying services are performed and a binding contractual commitment has been established with the customer. If our customers do not agree to contract changes upon changes in our scope of work, we could be exposed to cost overruns and reduced contract profitability. Costs are not deferred in anticipation of contracts being awarded or amendments being finalized, but are expensed as incurred.

Most contracts are terminable by the customer, either immediately or according to advance notice terms specified within the contracts. These contracts require payment of fees for services rendered through the date of termination and may require payment for subsequent services necessary to conclude the study or close out the contract. Final settlement amounts are agreed to with the customer based on remaining work to be performed. These amounts are included in revenue when we believe the amount can be estimated reliably and its realization is probable. In evaluating the probability of recognition, we consider the contractual basis for the settlement amount and the objective evidence available to support the amount.

Certain contracts contain volume rebate arrangements with our customers that provide for rebates if certain specified spending thresholds are met. These obligations are considered as a reduction in revenue when it appears probable that the arrangement thresholds will be met, which can be at contract inception.

We occasionally enter into incentive fee arrangements with customers that provide for additional compensation if certain defined contractual milestones or performance thresholds are met. These additional fees are included in the estimated transaction price when there is a basis to reasonably estimate the amount of the fee and when achievement of the incentive milestone is deemed probable. These estimates are based on anticipated performance, our best judgement at the time or ultimately, upon achievement of the threshold or milestone.

We record revenue net of any tax assessments by governmental authorities that are imposed and concurrent with specific revenue generating transactions.

Performance Obligations

Substantially all of our contracts consist of a single performance obligation, as the promise to transfer the individual services described in the contracts are not separately identifiable from other promises in the contracts, and therefore not distinct. Revenue recognition is determined by assessing the progress of performance completed or delivered to date compared to total services to be delivered under the terms of the arrangement. The measures utilized to assess progress on the satisfaction of performance are specific to the performance obligation identified in the contract.

For the majority of our contract performance obligations, we utilize the input method of cost to cost to measure progress, as the Company has determined that it is the most consistent measure of progress among contract tasks and represents the most faithful depiction of the transfer of services over the contract life. Under this method, the Company determines cost incurred to date for the services it provides compared to the total estimated costs at completion.

For certain other contractual performance obligations, the Company has determined that an output method is the best measure of progress. These relate to certain unitized contracts, and the Company recognizes revenue in the period in which the unit is delivered compared to total contracted units.

On March 31, 2018, we had approximately $915 million of performance obligations remaining to be performed for active projects.

Costs and Expenses

Total direct costs

The Company incurs costs associated with service delivery including direct labor and related employee benefits, laboratory supplies, and other expenses. These costs are recorded in Direct service costs, excluding depreciation and amortization as a component of Total direct costs in the accompanying condensed consolidated statements of operations.

In addition, the Company incurs expenses on behalf of its customers for various project expenditures including, but not limited to, investigator site payments, travel, meetings, printing, and shipping and handling fees that are reimbursed by our customers at cost. These costs are included in Reimburseable out-of-pocket expenses as a component of Total direct costs in the accompanying condensed consolidated statements of operations.

Total direct costs are expensed as incurred and are not deferred in anticipation of contracts being awarded or finalization of changes in scope.

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 US GAAP and International Financial Reporting Standards. The new standard became effective for the Company in the first quarter 2018.

Under ASC 606, the majority of the Company’s contracts will have a single performance obligation that is satisfied over time, with revenue recognized based on overall project progress measured as of the financial statement date. This represents a change in the Company’s previous revenue accounting methodology, Accounting Standards Codification Topic 605, Revenue Recognition (“ASC 605”), as a majority of contracts were accounted for under the multiple element arrangement guidance. Under the previous revenue recognition accounting methodology, certain revenue related to reimbursable expenses was presented either as a separate line item within Reimbursable out-of-pocket revenue or net of related expenses within Service revenue, net in the condensed consolidated statements of operations. As a result of having a single performance obligation, the Company accounts for all revenue related to reimbursable expenses on a gross basis within a single revenue line item. Measurement of progress on contracts with customers will generally be based on the input measurement of cost incurred relative to the total expected costs to satisfy the performance obligation.

The Company elected to utilize the modified retrospective implementation method for its transition to ASC 606 as of January 1, 2018 (the “Implementation Date”). Under this implementation method, the Company recognized the cumulative effect of initially applying the ASC 606 revenue recognition guidance to contracts that were not completed at the Implementation Date. At the Implementation Date, the Company elected to reflect the aggregate effect of all contract modifications that occurred before January 1, 2018 in determining the satisfied and unsatisfied performance obligations and determination of the transaction price.

The cumulative effect adjustment was recorded to the opening balance of Accumulated deficit in the condensed consolidated balance sheets in the amount of $(9.7) million, with offsetting amounts of $9.8 million to Accounts receivable and unbilled, net, $3.3 million to Deferred income taxes, $34.5 million to Accrued expenses, $(57.4) million to Pre-funded study costs and $45.7 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.

In connection with the implementation of ASC 606 on the modified retrospective method, we are presenting additional information to assist with the comparability of select line items of the current and prior period year to date reporting in our Condensed Consolidated Balance Sheets and Condensed Consolidated Statement of Operations. Below we have presented the amount by which each financial statement line item is affected in the current reporting period by the application of ASC 606 as compared with the guidance that was in effect before the change (ASC 605).

	Three Months Ended March 31, 2018
	As Reported			Adjustments			As Revised under ASC 605
Revenue:
Revenue, net	$	163,077		$	(163,077	)	$	-
Service revenue, net		-			108,428			108,428
Reimbursed out-of-pocket revenue		-			15,017			15,017
Total revenue		163,077			(39,632	)		123,445
Operating expenses:
Direct service costs, excluding depreciation and amortization		60,341			-			60,341
Reimbursed out-of-pocket expenses		56,913			(41,896	)		15,017
Total direct costs		117,254			(41,896	)		75,358
Total operating expenses		142,958			(41,896	)		101,062
Income from operations		20,119			2,264			22,383
Income before income taxes		17,657			2,264			19,921
Income tax provision		3,106			511			3,617
Net income	$	14,551		$	1,753		$	16,304
Net income per share attributable to common shareholders:
Basic	$	0.41		$	0.05		$	0.46
Diluted	$	0.40		$	0.05		$	0.45
Weighted average common shares outstanding:
Basic		35,486			-			35,486
Diluted		36,449			-			36,449

ASSETS	As of March 31, 2018
Current assets:	As Reported			Adjustments			As Revised under ASC 605
Accounts receivable and unbilled, net		110,654			(12,733	)		97,921
Total current assets		153,754			(12,733	)		141,021
Deferred income taxes		9,970			(3,347	)		6,623
Total assets	$	973,024		$	(16,080	)	$	956,944
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses		63,576			(45,145	)		18,431
Pre-funded study costs		-			57,487			57,487
Advanced billings		126,387			(40,356	)		86,031
Other current liabilities		8,105			511			8,616
Total current liabilities		232,492			(27,503	)		204,989
Total liabilities		461,951			(27,503	)		434,448
Shareholders’ equity:
Accumulated deficit		(115,521	)		11,423			(104,098	)
Total shareholders’ equity		511,073			11,423			522,496
Total liabilities and shareholders’ equity	$	973,024		$	(16,080	)	$	956,944

CASH FLOWS FROM OPERATING ACTIVITIES:	Three Months Ended March 31, 2018
	As Reported			Adjustments			As Revised under ASC 605
Net income		14,551			1,753			16,304
Changes in assets and liabilities:
Accounts receivable and unbilled, net		(17,760	)		2,980			(14,780	)
Accrued expenses		5,268			(10,664	)		(5,396	)
Pre-funded study costs		-			50			50
Advanced billings		6,817			5,370			12,187
Other assets and liabilities, net		3,089			511			3,600
Net cash (used in) provided by operating activities		23,298			-			23,298

In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2017-01, Business Combinations. The standard changes the definition of a business to assist entities with evaluating when a set of transferred assets and activities is a business. Under the new guidance, an entity first determines whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If this threshold is met, the set is not a business. If it’s not met, the entity then evaluates whether the set meets the requirement that a business include, at a minimum, an input and a substantive process that together significantly contribute to the ability to create outputs. ASU 2017-01 is effective for fiscal years beginning after December 15, 2017, and for interim periods within those fiscal years. The Company, as permitted, early adopted ASU 2017-01 using the prospective method in the second quarter of 2017.

Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The guidance in ASU 2016-02 supersedes the lease recognition requirements in ASC Topic 840, Leases (FAS 13). ASU 2016-02 requires an entity to recognize assets and liabilities arising from a lease for both financing and operating leases, along with additional qualitative and quantitative disclosures. ASU 2016-02 will be applied on a modified retrospective basis to each prior reporting period presented and is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the effect this standard will have on its condensed consolidated financial statements.

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 is currently evaluating the effect this standard will have on its condensed consolidated financial statements.

Net Income Per Share

3 Months Ended

Mar. 31, 2018

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 months ended March 31, 2018 and 2017 (in thousands, except for earnings per share):

	Three Months Ended
	March 31,
	2018		2017
Weighted-average shares:
Common shares outstanding		35,486		40,669
RSAs		146		59
Total weighted-average shares		35,632		40,728
Earnings per common share—Basic
Net income	$	14,551	$	8,447
Less: Undistributed earnings allocated to RSAs		60		12
Net income available to common shareholders—Basic	$	14,491	$	8,435

Net income per common share—Basic	$	0.41	$	0.21

Basic weighted-average common shares outstanding		35,486		40,669
Effect of diluted shares		963		839
Diluted weighted-average shares outstanding		36,449		41,508

Net income per common share—Diluted	$	0.40	$	0.20

During the three months ended March 31, 2018, the Company had 35,000 stock options 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	3 Months Ended
Fair Value Measurements	Mar. 31, 2018
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 March 31, 2018. There were no transfers between Level 1, Level 2 or Level 3 during the three months ended March 31, 2018 or 2017.

- 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

3 Months Ended

Mar. 31, 2018

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
	March 31,			January 1,					December 31,
	2018			2018			Adjustments		2017
Accounts receivable	$	67,616		$	55,599		$	-	$	55,599
Unbilled receivables		43,688			37,906			9,753		28,153
Less: allowance for doubtful accounts		(650	)		(673	)		-		(673	)
Total accounts receivable and unbilled, net	$	110,654		$	92,832		$	9,753	$	83,079

Unbilled receivables increased from $37.9 million at January 1, 2018, which includes adjustments of $9.8 million related to the adoption of ASC 606, to $43.7 million at March 31, 2018. The increase is primarily driven by revenue recognized on certain contracts in advance of 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
	March 31,		January 1,					December 31,
	2018		2018		Adjustments			2017
Advanced billings	$	126,387	$	119,451	$	45,695		$	73,756
Pre-funded study costs	$	-	$	-	$	(57,406	)	$	57,406

Advanced billings increased from $119.5 million at January 1, 2018, which includes adjustments of $45.7 million related to the adoption of ASC 606, to $126.4 million at March 31, 2018. The increase is primarily driven by billing and/or collection activity in the three months ended March 31, 2018 in advance of revenue being earned for services performed.

Intangible Assets, Net

3 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

(6) Intangible Assets, Net

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

	As of
	March 31,			December 31,
	2018			2017
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		(97,155	)		(92,661	)
Developed technologies		(43,580	)		(40,856	)
Other		(2,162	)		(1,989	)
Total accumulated amortization		(215,527	)		(208,136	)
Total finite-lived intangible assets, net		59,703			67,094
Trade name (indefinite-lived)		31,646			31,646
Total intangible assets, net	$	91,349		$	98,740

As of March 31, 2018, 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 2018	$	22,170
2019		14,829
2020		7,876
2021		5,114
2022		3,353
Later years		6,361
	$	59,703

Accrued Expenses

3 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Accrued Expenses

(7) Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2018		2017
Employee compensation and benefits	$	14,170	$	19,707
Project related reimbursable expenses		45,145		-
Other		4,261		3,966
Total accrued expenses	$	63,576	$	23,673

Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

(8) Debt

Debt consisted of the following (in thousands):

	As of
	March 31,			December 31,
	2018			2017

Revolving credit facility	$	50,000		$	70,000
Term loan		148,500			152,625
Less unamortized discount		(367	)		(399	)
Less unamortized term loan debt issuance costs		(566	)		(615	)
Less current portion of long-term debt		(16,500	)		(16,500	)
Long-term debt, net, less current portion	$	181,067		$	205,111

Principal payments on debt are due as follows (in thousands):

2018 (remaining)	$	12,375
2019		16,500
2020		20,625
2021		149,000
Total	$	198,500

The estimated fair value of the Company’s debt based on Level 2 inputs using the market approach, which is primarily based on rates at which the debt is traded among financial institutions, approximates the carrying value as of March 31, 2018 and December 31, 2017.

Shareholder's Equity and Stock-Based Compensation

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Shareholder's Equity and Stock-Based Compensation

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

The Company granted 504,500 awards to employees under the 2016 Incentive Award Plan during the three months ended March 31, 2018, consisting of 406,500 stock option awards and 98,000 restricted stock units (“RSU”), all vesting after four years. The Company granted 700,050 stock options, vesting after four years, to employees under the 2016 Incentive Award Plan during the three months ended March 31, 2017.

Award Activity

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

	Three Months Ended March 31, 2018
				Weighted Average
	Stock Options			Exercise Price
Outstanding - beginning of period		2,782,868		$	20.73
Granted		406,500		$	32.05
Exercised		(38,161	)	$	14.83
Forfeited/Expired		(62,361	)	$	19.62
Outstanding - end of period		3,088,846		$	22.32

Exercisable - end of period		957,504		$	15.54

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

	Three Months Ended
	March 31, 2018
	Shares/Units
Outstanding and unvested - beginning of period		183,629
Granted		98,000
Vested		-
Forfeited		(2,000	)
Outstanding and unvested - end of period		279,629

Cumulative vested shares - end of period		1,884,287

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 March 31,
	2018		2017
Total direct costs	$	843	$	542
Selling, general and administrative		624		492
Total stock-based compensation expense	$	1,467	$	1,034

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	(10) Income Taxes The Company’s effective income tax rate was 17.6% and 38.7% for the three months ended March 31, 2018 and 2017, respectively. The Company’s effective income tax rate for the three months ended March 31, 2018 varied from the U.S. statutory rate of 21% primarily due to the benefit of uncertain tax positions coupled with a favorable tax impact associated with previously acquired tax attributes. The Company recognized the income tax effects of the “Tax Cuts and Jobs Act” (TCJA) in its audited consolidated financial statements on our 2017 Annual Report on Form 10-K in accordance with Staff Accounting Bulletin No. 118, which provides Securities and Exchange Commission staff guidance for the application of ASC Topic 740, Income Taxes, in the reporting period in which the TCJA was signed into law. The guidance also provides for a measurement period of up to one year from the enactment date for the Company to complete the accounting for the U.S. tax law changes. As such, the Company’s 2017 financial results reflected the provisional estimate of the income tax effects of the TCJA. No subsequent adjustments have been made to the amounts recorded as of December 31, 2017, which continue to represent a provisional estimate of the impact of TCJA. Accordingly, there is no impact to the March 31, 2018 effective tax rate for such provisional amounts. The estimate of the impact of TCJA is based on certain assumptions and the Company's current interpretation, and may change, as the Company receives additional clarification and implementation guidance and as the interpretation of the TCJA evolves over time. TCJA made broad and complex changes to the U.S. tax code, including a new tax law that may subject the Company to a tax on global intangible low-taxed income (“GILTI”) beginning in 2018. GILTI is a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. Companies subject to GILTI have the option to account for the GILTI tax as a period cost if and when incurred, or to recognize deferred taxes for temporary differences including outside basis differences expected to reverse as GILTI. We have not yet determined our policy election with respect to whether to record deferred taxes for basis differences expected to reverse as a result of the GILTI provisions in future periods or use the period cost method. We have, however, included an estimate of the current GILTI impact in our tax provision for 2018.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	(11) 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 March 31, 2018 and December 31, 2017. 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 March 31, 2018.

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	(12) 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 March 31, 2018 and December 31, 2017, 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 Coherus BioSciences, Inc. (“Coherus”) The chief executive officer of the Company was a member of Coherus’s board of directors until his resignation in the first quarter of 2018. Coherus is no longer considered a related party as of the first quarter of 2018. During the three months ended March 31, 2017, the Company recognized service revenue from Coherus of $3.3 million in the Company’s condensed consolidated statements of operations. In addition, the company recognized Reimbursed out-of-pocket revenue with Coherus in the condensed consolidated statements of operations of $0.6 million during the three months ended March 31, 2017. As of December 31, 2017, the Company had Accounts receivable and unbilled, net from Coherus of $0.3 million recorded in the condensed consolidated balance sheets. As of December 31, 2017, the Company had, from Coherus, $1.5 million of Advanced billings and $1.0 million of Pre-funded study costs, in the condensed consolidated balance sheets. Xenon Pharmaceuticals, Inc. (“Xenon”) Certain executives and employees of the Company, including the chief executive officer, have held equity investments in Xenon, a clinical-stage biopharmaceutical company. During the second quarter of 2017, the chief executive officer sold his entire equity position held in Xenon. Xenon is no longer considered to be a related party subsequent to this sale. The Company recognized service revenue from Xenon of $0.5 million during the three months ended March 31, 2017 in the Company’s condensed consolidated statements of operations. 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 months ended March 31, 2018, the Company recognized total revenue from Cymabay of $0.7 million and for the three months ended March 31, 2017, the Company recognized service revenue from Cymabay of $0.1 million in the Company’s condensed consolidated statements of operations. As of March 31, 2018 and December 31, 2017, respectively, the Company had Accounts receivable and unbilled, net from Cymabay of $0.6 million and $0.1 million recorded in the condensed consolidated balance sheets. As of March 31, 2018, the Company had, from Cymabay, $0.1 million in Advanced billings. LIB Therapeutics LLC (“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 months ended March 31, 2018, the Company recognized total revenue from LIB of $0.8 million and for the three months ended March 31, 2017, the Company recognized service revenue from LIB of $0.1 million, respectively, in the Company’s condensed consolidated statements of operations. As of March 31, 2018 and December 31, 2017, respectively, the Company had Advanced billings from LIB of $0.2 million and $0.2 million recorded in the condensed consolidated balance sheets. In addition, as of March 31, 2018 and December 31, 2017, respectively, the Company had Accounts receivable and unbilled, net from LIB of $0.7 million and $0.5 million recorded in the condensed consolidated balance sheets. Purchase of Real Estate Properties In December 2016, the Company entered into a purchase agreement for four parcels of real estate property that are closely situated to the Medpace campus in Cincinnati, Ohio, from AT Redevelopment Company, LLC, which is wholly-owned by the Company’s chief executive officer. The purchase price of the real estate property was $0.4 million as determined by an independent third party broker's opinion of value. The transaction closed on January 11, 2017. 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 the corporate headquarters allows for adjustments to the rental rate annually for increases in the consumer price index. Lease expense recognized for each of the three months ended March 31, 2018 and 2017 was $0.5 million, respectively. The lease expense was allocated between Total direct costs and Selling, general and administrative in the condensed consolidated statements of operations. Deemed Assets and Deemed Landlord Liabilities 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. In accordance with the accounting guidance related to leases, 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 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 deemed assets are being fully depreciated, on a straight line basis, over the 15-year term of the lease. Deemed landlord liabilities are 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 is 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 $0.9 million during the three months ended March 31, 2018 and 2017, respectively. The current and long-term portions of the Deemed landlord liability at March 31, 2018 were $2.0 million and $26.1 million, respectively. The current and long-term portions of the Deemed landlord liability at December 31, 2017 were $1.9 million and $26.6 million, respectively. The Company has recognized deemed assets, net of $15.9 million and $16.3 million at March 31, 2018 and December 31, 2017, respectively, 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 $0.4 million and $0.3 million during the three months ended March 31, 2018 and 2017, 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.

Entity Wide Disclosures

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Entity Wide Disclosure

(13) Entity Wide Disclosures

Revenue by Category

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

	Three months Ended March 31, 2018
Therapeutic Area
Oncology	$	43,853
Metabolic		22,055
Cardiology		23,736
AVAI		16,679
Endocrine		6,458
Central Nervous System		13,165
Medical Devices		2,914
Other		34,217
Total Revenue	$	163,077

Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

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, 2017.

Revenue Recognition

Contract Assumptions

We record revenue net of any tax assessments by governmental authorities that are imposed and concurrent with specific revenue generating transactions.

Performance Obligations

On March 31, 2018, we had approximately $915 million of performance obligations remaining to be performed for active projects.

Costs and Expenses

Total direct costs

Total direct costs are expensed as incurred and are not deferred in anticipation of contracts being awarded or finalization of changes in scope.

Recently Adopted and Issued Accounting Standards

Recently Adopted Accounting Standards

	Three Months Ended March 31, 2018
	As Reported			Adjustments			As Revised under ASC 605
Revenue:
Revenue, net	$	163,077		$	(163,077	)	$	-
Service revenue, net		-			108,428			108,428
Reimbursed out-of-pocket revenue		-			15,017			15,017
Total revenue		163,077			(39,632	)		123,445
Operating expenses:
Direct service costs, excluding depreciation and amortization		60,341			-			60,341
Reimbursed out-of-pocket expenses		56,913			(41,896	)		15,017
Total direct costs		117,254			(41,896	)		75,358
Total operating expenses		142,958			(41,896	)		101,062
Income from operations		20,119			2,264			22,383
Income before income taxes		17,657			2,264			19,921
Income tax provision		3,106			511			3,617
Net income	$	14,551		$	1,753		$	16,304
Net income per share attributable to common shareholders:
Basic	$	0.41		$	0.05		$	0.46
Diluted	$	0.40		$	0.05		$	0.45
Weighted average common shares outstanding:
Basic		35,486			-			35,486
Diluted		36,449			-			36,449

ASSETS	As of March 31, 2018
Current assets:	As Reported			Adjustments			As Revised under ASC 605
Accounts receivable and unbilled, net		110,654			(12,733	)		97,921
Total current assets		153,754			(12,733	)		141,021
Deferred income taxes		9,970			(3,347	)		6,623
Total assets	$	973,024		$	(16,080	)	$	956,944
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses		63,576			(45,145	)		18,431
Pre-funded study costs		-			57,487			57,487
Advanced billings		126,387			(40,356	)		86,031
Other current liabilities		8,105			511			8,616
Total current liabilities		232,492			(27,503	)		204,989
Total liabilities		461,951			(27,503	)		434,448
Shareholders’ equity:
Accumulated deficit		(115,521	)		11,423			(104,098	)
Total shareholders’ equity		511,073			11,423			522,496
Total liabilities and shareholders’ equity	$	973,024		$	(16,080	)	$	956,944

CASH FLOWS FROM OPERATING ACTIVITIES:	Three Months Ended March 31, 2018
	As Reported			Adjustments			As Revised under ASC 605
Net income		14,551			1,753			16,304
Changes in assets and liabilities:
Accounts receivable and unbilled, net		(17,760	)		2,980			(14,780	)
Accrued expenses		5,268			(10,664	)		(5,396	)
Pre-funded study costs		-			50			50
Advanced billings		6,817			5,370			12,187
Other assets and liabilities, net		3,089			511			3,600
Net cash (used in) provided by operating activities		23,298			-			23,298

Recently Issued Accounting Standards

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Impact of Adoption of Accounting Standards

	Three Months Ended March 31, 2018
	As Reported			Adjustments			As Revised under ASC 605
Revenue:
Revenue, net	$	163,077		$	(163,077	)	$	-
Service revenue, net		-			108,428			108,428
Reimbursed out-of-pocket revenue		-			15,017			15,017
Total revenue		163,077			(39,632	)		123,445
Operating expenses:
Direct service costs, excluding depreciation and amortization		60,341			-			60,341
Reimbursed out-of-pocket expenses		56,913			(41,896	)		15,017
Total direct costs		117,254			(41,896	)		75,358
Total operating expenses		142,958			(41,896	)		101,062
Income from operations		20,119			2,264			22,383
Income before income taxes		17,657			2,264			19,921
Income tax provision		3,106			511			3,617
Net income	$	14,551		$	1,753		$	16,304
Net income per share attributable to common shareholders:
Basic	$	0.41		$	0.05		$	0.46
Diluted	$	0.40		$	0.05		$	0.45
Weighted average common shares outstanding:
Basic		35,486			-			35,486
Diluted		36,449			-			36,449

ASSETS	As of March 31, 2018
Current assets:	As Reported			Adjustments			As Revised under ASC 605
Accounts receivable and unbilled, net		110,654			(12,733	)		97,921
Total current assets		153,754			(12,733	)		141,021
Deferred income taxes		9,970			(3,347	)		6,623
Total assets	$	973,024		$	(16,080	)	$	956,944
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses		63,576			(45,145	)		18,431
Pre-funded study costs		-			57,487			57,487
Advanced billings		126,387			(40,356	)		86,031
Other current liabilities		8,105			511			8,616
Total current liabilities		232,492			(27,503	)		204,989
Total liabilities		461,951			(27,503	)		434,448
Shareholders’ equity:
Accumulated deficit		(115,521	)		11,423			(104,098	)
Total shareholders’ equity		511,073			11,423			522,496
Total liabilities and shareholders’ equity	$	973,024		$	(16,080	)	$	956,944

CASH FLOWS FROM OPERATING ACTIVITIES:	Three Months Ended March 31, 2018
	As Reported			Adjustments			As Revised under ASC 605
Net income		14,551			1,753			16,304
Changes in assets and liabilities:
Accounts receivable and unbilled, net		(17,760	)		2,980			(14,780	)
Accrued expenses		5,268			(10,664	)		(5,396	)
Pre-funded study costs		-			50			50
Advanced billings		6,817			5,370			12,187
Other assets and liabilities, net		3,089			511			3,600
Net cash (used in) provided by operating activities		23,298			-			23,298

Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2018

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 months ended March 31, 2018 and 2017 (in thousands, except for earnings per share):

	Three Months Ended
	March 31,
	2018		2017
Weighted-average shares:
Common shares outstanding		35,486		40,669
RSAs		146		59
Total weighted-average shares		35,632		40,728
Earnings per common share—Basic
Net income	$	14,551	$	8,447
Less: Undistributed earnings allocated to RSAs		60		12
Net income available to common shareholders—Basic	$	14,491	$	8,435

Net income per common share—Basic	$	0.41	$	0.21

Basic weighted-average common shares outstanding		35,486		40,669
Effect of diluted shares		963		839
Diluted weighted-average shares outstanding		36,449		41,508

Net income per common share—Diluted	$	0.40	$	0.20

Contract Assets and Contract Liabilities (Tables)

3 Months Ended

Mar. 31, 2018

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
	March 31,			January 1,					December 31,
	2018			2018			Adjustments		2017
Accounts receivable	$	67,616		$	55,599		$	-	$	55,599
Unbilled receivables		43,688			37,906			9,753		28,153
Less: allowance for doubtful accounts		(650	)		(673	)		-		(673	)
Total accounts receivable and unbilled, net	$	110,654		$	92,832		$	9,753	$	83,079

Advanced billings consisted of the following (in thousands):

	As of
	March 31,		January 1,					December 31,
	2018		2018		Adjustments			2017
Advanced billings	$	126,387	$	119,451	$	45,695		$	73,756
Pre-funded study costs	$	-	$	-	$	(57,406	)	$	57,406

Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets, Net

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

	As of
	March 31,			December 31,
	2018			2017
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		(97,155	)		(92,661	)
Developed technologies		(43,580	)		(40,856	)
Other		(2,162	)		(1,989	)
Total accumulated amortization		(215,527	)		(208,136	)
Total finite-lived intangible assets, net		59,703			67,094
Trade name (indefinite-lived)		31,646			31,646
Total intangible assets, net	$	91,349		$	98,740

Schedule of Estimated Amortization Expense of Intangible Assets

As of March 31, 2018, 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 2018	$	22,170
2019		14,829
2020		7,876
2021		5,114
2022		3,353
Later years		6,361
	$	59,703

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	As of
	March 31,		December 31,
	2018		2017
Employee compensation and benefits	$	14,170	$	19,707
Project related reimbursable expenses		45,145		-
Other		4,261		3,966
Total accrued expenses	$	63,576	$	23,673

Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Debt

Debt consisted of the following (in thousands):

	As of
	March 31,			December 31,
	2018			2017

Revolving credit facility	$	50,000		$	70,000
Term loan		148,500			152,625
Less unamortized discount		(367	)		(399	)
Less unamortized term loan debt issuance costs		(566	)		(615	)
Less current portion of long-term debt		(16,500	)		(16,500	)
Long-term debt, net, less current portion	$	181,067		$	205,111

Schedule of Principal Payments on Debt Due

Principal payments on debt are due as follows (in thousands):

2018 (remaining)	$	12,375
2019		16,500
2020		20,625
2021		149,000
Total	$	198,500

- 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://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

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

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Stock Option Activity

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

	Three Months Ended March 31, 2018
				Weighted Average
	Stock Options			Exercise Price
Outstanding - beginning of period		2,782,868		$	20.73
Granted		406,500		$	32.05
Exercised		(38,161	)	$	14.83
Forfeited/Expired		(62,361	)	$	19.62
Outstanding - end of period		3,088,846		$	22.32

Exercisable - end of period		957,504		$	15.54

Schedule of RSA/RSU Activity

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

	Three Months Ended
	March 31, 2018
	Shares/Units
Outstanding and unvested - beginning of period		183,629
Granted		98,000
Vested		-
Forfeited		(2,000	)
Outstanding and unvested - end of period		279,629

Cumulative vested shares - end of period		1,884,287

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 March 31,
	2018		2017
Total direct costs	$	843	$	542
Selling, general and administrative		624		492
Total stock-based compensation expense	$	1,467	$	1,034

Entity Wide Disclosures (Tables)

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Summary of Revenue by Major Source

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

	Three months Ended March 31, 2018
Therapeutic Area
Oncology	$	43,853
Metabolic		22,055
Cardiology		23,736
AVAI		16,679
Endocrine		6,458
Central Nervous System		13,165
Medical Devices		2,914
Other		34,217
Total Revenue	$	163,077

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Performance obligations remaining to be performed	$ 915,000
Accumulated deficit	(115,521)		$ (120,402)
Accounts receivable and unbilled, net	110,654		83,079
Deferred income taxes	9,970		6,343
Accrued expenses	63,576		23,673
Pre-funded study costs	0		57,406
Advanced billings	126,387		$ 73,756
ASC 606
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable and unbilled, net		$ 92,832
Advanced billings		119,451
ASC 606 \| Impact of Adoption of ASC 606 - Adjustments
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	11,423	(9,700)
Accounts receivable and unbilled, net	(12,733)	9,753
Deferred income taxes	(3,347)	3,300
Accrued expenses	(45,145)	34,500
Pre-funded study costs	57,487	(57,406)
Advanced billings	$ (40,356)	$ 45,695

Summary of Significant Accounting Policies - Summary of Impact of Adoption of Accounting Standards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenue:
Revenue, net	$ 163,077	$ 0
Service revenue, net	0	93,781
Reimbursed out-of-pocket revenue	0	12,830
Total revenue	163,077	106,611
Operating expenses:
Direct service costs, excluding depreciation and amortization	60,341	51,105
Reimbursed out-of-pocket expenses	56,913	12,830
Total direct costs	117,254	63,935
Total operating expenses	142,958	90,667
Income from operations	20,119	15,944
Income before income taxes	17,657	13,778
Income tax provision	3,106	5,331
Net income	$ 14,551	$ 8,447
Net income per share attributable to common shareholders:
Basic	$ 0.41	$ 0.21
Diluted	$ 0.40	$ 0.20
Weighted average common shares outstanding:
Basic	35,486	40,669
Diluted	36,449	41,508
Current assets:
Accounts receivable and unbilled, net	$ 110,654			$ 83,079
Total current assets	153,754			129,971
Deferred income taxes	9,970			6,343
Total assets	973,024			950,717
Current liabilities:
Accrued expenses	63,576			23,673
Pre-funded study costs	0			57,406
Advanced billings	126,387			73,756
Other current liabilities	8,105			4,697
Total current liabilities	232,492			192,706
Total liabilities	461,951			447,187
Shareholders’ equity:
Accumulated deficit	(115,521)			(120,402)
Total shareholders’ equity	511,073			503,530
Total liabilities and shareholders’ equity	973,024			$ 950,717
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	14,551	$ 8,447
Changes in assets and liabilities:
Accounts receivable and unbilled, net	(17,760)	(2,292)
Accrued expenses	5,268	(10,508)
Pre-funded study costs	0	(3,497)
Advanced billings	6,817	(5,246)
Other assets and liabilities, net	3,089	1,884
Net cash (used in) provided by operating activities	23,298	$ (675)
ASC 606
Current assets:
Accounts receivable and unbilled, net			$ 92,832
Current liabilities:
Advanced billings			119,451
ASC 606 \| Impact of Adoption of ASC 606 - Adjustments
Revenue:
Revenue, net	(163,077)
Service revenue, net	108,428
Reimbursed out-of-pocket revenue	15,017
Total revenue	(39,632)
Operating expenses:
Reimbursed out-of-pocket expenses	(41,896)
Total direct costs	(41,896)
Total operating expenses	(41,896)
Income from operations	2,264
Income before income taxes	2,264
Income tax provision	511
Net income	$ 1,753
Net income per share attributable to common shareholders:
Basic	$ 0.05
Diluted	$ 0.05
Current assets:
Accounts receivable and unbilled, net	$ (12,733)		9,753
Total current assets	(12,733)
Deferred income taxes	(3,347)		3,300
Total assets	(16,080)
Current liabilities:
Accrued expenses	(45,145)		34,500
Pre-funded study costs	57,487		(57,406)
Advanced billings	(40,356)		45,695
Other current liabilities	511
Total current liabilities	(27,503)
Total liabilities	(27,503)
Shareholders’ equity:
Accumulated deficit	11,423		$ (9,700)
Total shareholders’ equity	11,423
Total liabilities and shareholders’ equity	(16,080)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	1,753
Changes in assets and liabilities:
Accounts receivable and unbilled, net	2,980
Accrued expenses	(10,664)
Pre-funded study costs	50
Advanced billings	5,370
Other assets and liabilities, net	511
ASC 606 \| Impact of Adoption of ASC 606 - As Revised under ASC 605
Revenue:
Revenue, net	0
Service revenue, net	108,428
Reimbursed out-of-pocket revenue	15,017
Total revenue	123,445
Operating expenses:
Direct service costs, excluding depreciation and amortization	60,341
Reimbursed out-of-pocket expenses	15,017
Total direct costs	75,358
Total operating expenses	101,062
Income from operations	22,383
Income before income taxes	19,921
Income tax provision	3,617
Net income	$ 16,304
Net income per share attributable to common shareholders:
Basic	$ 0.46
Diluted	$ 0.45
Weighted average common shares outstanding:
Basic	35,486
Diluted	36,449
Current assets:
Accounts receivable and unbilled, net	$ 97,921
Total current assets	141,021
Deferred income taxes	6,623
Total assets	956,944
Current liabilities:
Accrued expenses	18,431
Pre-funded study costs	57,487
Advanced billings	86,031
Other current liabilities	8,616
Total current liabilities	204,989
Total liabilities	434,448
Shareholders’ equity:
Accumulated deficit	(104,098)
Total shareholders’ equity	522,496
Total liabilities and shareholders’ equity	956,944
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	16,304
Changes in assets and liabilities:
Accounts receivable and unbilled, net	(14,780)
Accrued expenses	(5,396)
Pre-funded study costs	50
Advanced billings	12,187
Other assets and liabilities, net	3,600
Net cash (used in) provided by operating activities	$ 23,298

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
	Mar. 31, 2018	Mar. 31, 2017
Weighted-average shares:
Basic weighted-average common shares outstanding	35,486	40,669
Total weighted-average shares	35,632	40,728
Earnings per common share—Basic
Net income	$ 14,551	$ 8,447
Net income available to common shareholders—Basic	$ 14,491	$ 8,435
Net income per common share—Basic	$ 0.41	$ 0.21
Basic weighted-average common shares outstanding	35,486	40,669
Effect of diluted shares	963	839
Diluted weighted-average shares outstanding	36,449	41,508
Net income per common share—Diluted	$ 0.40	$ 0.20
RSAs
Weighted-average shares:
Basic weighted-average common shares outstanding	146	59
Earnings per common share—Basic
Less: Undistributed earnings allocated to RSAs	$ 60	$ 12
Basic weighted-average common shares outstanding	146	59
Common Stock
Weighted-average shares:
Basic weighted-average common shares outstanding	35,486	40,669
Earnings per common share—Basic
Basic weighted-average common shares outstanding	35,486	40,669

Net Income Per Share - Additional Information (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2018 shares
Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted EPS	35,000

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair value measurements transfers between level 1, level 2, or level 3	$ 0	$ 0

Contract Assets and Contract Liabilities - Summary of Accounts Receivable and Unbilled, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract With Customer Asset And Liability [Line Items]
Accounts receivable	$ 67,616		$ 55,599
Unbilled receivables	43,688		28,153
Less: allowance for doubtful accounts	(650)		(673)
Total accounts receivable and unbilled, net	110,654		$ 83,079
ASC 606
Contract With Customer Asset And Liability [Line Items]
Accounts receivable		$ 55,599
Unbilled receivables		37,906
Less: allowance for doubtful accounts		(673)
Total accounts receivable and unbilled, net		92,832
ASC 606 \| Impact of Adoption of ASC 606 - Adjustments
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables		9,753
Total accounts receivable and unbilled, net	$ (12,733)	$ 9,753

Contract Assets and Contract Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables	$ 43,688		$ 28,153
Advanced billings	126,387		$ 73,756
ASC 606
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables		$ 37,906
Advanced billings		119,451
ASC 606 \| Impact of Adoption of ASC 606 - Adjustments
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables		9,753
Advanced billings	$ (40,356)	$ 45,695

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References + Details

Contract Assets and Contract Liabilities - Summary of Advanced Bllings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract With Customer Asset And Liability [Line Items]
Advanced billings	$ 126,387		$ 73,756
Pre-funded study costs (includes $1.0 million with related parties at December 31, 2017)	0		$ 57,406
ASC 606
Contract With Customer Asset And Liability [Line Items]
Advanced billings		$ 119,451
ASC 606 \| Impact of Adoption of ASC 606 - Adjustments
Contract With Customer Asset And Liability [Line Items]
Advanced billings	(40,356)	45,695
Pre-funded study costs (includes $1.0 million with related parties at December 31, 2017)	$ 57,487	$ (57,406)

- Definition

+ References + Details

Intangible Assets, Net - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-lived intangible assets:
Total finite-lived intangible assets	$ 275,230	$ 275,230
Accumulated amortization:
Total accumulated amortization	(215,527)	(208,136)
Total finite-lived intangible assets, net	59,703	67,094
Trade name (indefinite-lived)	31,646	31,646
Total intangible assets, net	91,349	98,740
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	(97,155)	(92,661)
Developed Technologies
Finite-lived intangible assets:
Total finite-lived intangible assets	54,475	54,475
Accumulated amortization:
Total accumulated amortization	(43,580)	(40,856)
Other
Finite-lived intangible assets:
Total finite-lived intangible assets	3,074	3,074
Accumulated amortization:
Total accumulated amortization	$ (2,162)	$ (1,989)

Intangible Assets, Net - Schedule of Estimated Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2018	$ 22,170
2019	14,829
2020	7,876
2021	5,114
2022	3,353
Later years	6,361
Total finite-lived intangible assets, net	$ 59,703	$ 67,094

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accrued Liabilities And Other Liabilities [Abstract]
Employee compensation and benefits	$ 14,170	$ 19,707
Project related reimbursable expenses	45,145	0
Other	4,261	3,966
Total accrued expenses	$ 63,576	$ 23,673

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt	$ 198,500
Less unamortized discount	(367)	$ (399)
Less unamortized term loan debt issuance costs	(566)	(615)
Less current portion of long-term debt	(16,500)	(16,500)
Long-term debt, net, less current portion	181,067	205,111
Revolving credit facility
Debt Instrument [Line Items]
Debt	50,000	70,000
Term loan
Debt Instrument [Line Items]
Debt	$ 148,500	$ 152,625

Debt - Schedule of Principal Payments on Debt Due (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Debt Disclosure [Abstract]
2018 (remaining)	$ 12,375
2019	16,500
2020	20,625
2021	149,000
Total	$ 198,500

Shareholder's Equity and Stock-Based Compensation - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted	406,500
2016 Incentive Award Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted	504,500
2016 Incentive Award Plan \| Stock Options \| Vesting After Four Years
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted	406,500	700,050
Award vesting period	4 years	4 years
2016 Incentive Award Plan \| Restricted Stock Units (RSU) \| Vesting After Four Years
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	4 years
Shares granted	98,000

Shareholder's Equity and Stock-Based Compensation - Schedule of Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Equity [Abstract]
Number of Stock Options, Outstanding - beginning of period \| shares	2,782,868
Number of Stock Options, Granted \| shares	406,500
Number of Stock Options, Exercised \| shares	(38,161)
Number of Stock Options, Forfeited/Expired \| shares	(62,361)
Number of Stock Options, Outstanding - end of period \| shares	3,088,846
Number of Stock Options, Exercisable - end of period \| shares	957,504
Weighted Average Exercise Price, Outstanding - beginning of Period \| $ / shares	$ 20.73
Weighted Average Exercise Price, Granted \| $ / shares	32.05
Weighted Average Exercise Price, Exercised \| $ / shares	14.83
Weighted Average Exercise Price, Forfeited/Expired \| $ / shares	19.62
Weighted Average Exercise Price, Outstanding - end of period \| $ / shares	22.32
Weighted Average Exercise Price, Exercisable - end of period \| $ / shares	$ 15.54

Shareholder's Equity and Stock-Based Compensation - Schedule of RSA/RSU Activity (Details) - RSA/RSU	3 Months Ended
	Mar. 31, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding and unvested - beginning of period	183,629
Granted	98,000
Vested	0
Forfeited	(2,000)
Outstanding and unvested - end of period	279,629
Cumulative vested shares - end of period	1,884,287

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
	Mar. 31, 2018	Mar. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 1,467	$ 1,034
Total Direct Costs
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	843	542
Selling, General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 624	$ 492

Income Taxes - Additional Information (Details)	3 Months Ended
Income Taxes - Additional Information (Details)	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	17.60%	38.70%
U.S. statutory rate	21.00%

Related Party Transactions - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) RenewalOption Agreement Building	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 Parcel
Related Party Transaction [Line Items]
Reimbursed out-of-pocket revenue with related parties		$ 700
Accounts receivable and unbilled, net	1,300		$ 1,000
Advanced billings	300		1,700
Pre-funded study costs with related parties			1,000
Deemed landlord liability, long-term portions	26,091		26,602
Revenue, Net
Related Party Transaction [Line Items]
Revenue with related parties	1,500
Employee Loans \| Prepaid Expenses and Other Current Assets and Other Assets
Related Party Transaction [Line Items]
Employee advances receivables	200		200
Service Agreements \| Coherus Bio Sciences Inc
Related Party Transaction [Line Items]
Revenue with related parties		3,300
Reimbursed out-of-pocket revenue with related parties		600
Accounts receivable and unbilled, net			300
Advanced billings			1,500
Pre-funded study costs with related parties			1,000
Service Agreements \| Xenon
Related Party Transaction [Line Items]
Revenue with related parties		500
Service Agreements \| Cymabay
Related Party Transaction [Line Items]
Revenue with related parties		100
Accounts receivable and unbilled, net	600		100
Advanced billings	100
Service Agreements \| Cymabay \| Revenue, Net
Related Party Transaction [Line Items]
Revenue with related parties	700
Service Agreements \| LIB
Related Party Transaction [Line Items]
Revenue with related parties		100
Accounts receivable and unbilled, net	700		500
Advanced billings	200		200
Service Agreements \| LIB \| Revenue, Net
Related Party Transaction [Line Items]
Revenue with related parties	800
Purchase of Real Estate Properties \| Chief Executive Officer
Related Party Transaction [Line Items]
Number of parcel in real estate property \| Parcel				4
Purchase price of real estate property	$ 400
Transaction closed date	Jan. 11, 2017
Leased Real Estate \| Chief Executive Officer
Related Party Transaction [Line Items]
Term of lease	12 years
Lease expiration period	2022-11
Number of lease renewal, 10-year option \| RenewalOption	1
Lease term upon renewal	10 years
Lease expense recognized	$ 500	500
Leased Real Estate \| Chief Executive Officer And Immediate Family
Related Party Transaction [Line Items]
Number of lease renewal, 10-year option \| RenewalOption	1
Number of lease agreements \| Agreement	2
Number of buildings \| Building	2
Lease occupancy year	2012
Lease expiration year	2027
Lease term upon renewal	10 years
Term of lease	15 years
Related party capital lease payments	$ 1,000	900
Deemed landlord liability, current	2,000		1,900
Deemed landlord liability, long-term portions	26,100		26,600
Leased Real Estate \| Property and Equipment, Net \| Chief Executive Officer And Immediate Family \| Building
Related Party Transaction [Line Items]
Deemed assets, net	15,900		$ 16,300
Travel Services \| Chief Executive Officer
Related Party Transaction [Line Items]
Travel expenses with related party	$ 400	$ 300

Entity Wide Disclosures - Summary of Revenue by Major Source (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 163,077
Oncology
Disaggregation Of Revenue [Line Items]
Total Revenue	43,853
Metabolic
Disaggregation Of Revenue [Line Items]
Total Revenue	22,055
Cardiology
Disaggregation Of Revenue [Line Items]
Total Revenue	23,736
AVAI
Disaggregation Of Revenue [Line Items]
Total Revenue	16,679
Endocrine
Disaggregation Of Revenue [Line Items]
Total Revenue	6,458
Central Nervous System
Disaggregation Of Revenue [Line Items]
Total Revenue	13,165
Medical Devices
Disaggregation Of Revenue [Line Items]
Total Revenue	2,914
Other
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 34,217