Fair Value (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Summary of Assets Measured at Fair Value on Recurring Basis

The following are the major categories of assets measured at fair value on a recurring basis as of December 31, 2017 and 2016, using quoted prices in active markets for identical assets (Level 1); significant other observable inputs (Level 2); and significant unobservable inputs (Level 3):

	December 31, 2017
	(In thousands)
	(unaudited)
Description	QuotedPrices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets measured at fair value
Cash and cash equivalents	$	91,217	$	—	$	—	$	91,217
Restricted cash		6,389		—		—		6,389
Total Assets measured at fair value	$	97,606	$	—	$	—	$	97,606
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	12,418	$	12,418
Warrant liabilities		—		—	$	14,090	$	14,090
Total liabilities measured at fair value	$	—	$	—	$	26,508	$	26,508

	December 31, 2016
	(In thousands)
Description	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets measured at fair value
Cash and cash equivalents	$	24,165	$	—	$	—	$	24,165
Restricted cash		10,425	$	—	$	—		10,425
Total Assets measured at fair value	$	34,590	$	—	$	—	$	34,590
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	22,800	$	22,800
Total liabilities measured at fair value	$	—	$	—	$	22,800	$	22,800

Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classified in Level 3

The following table presents quantitative information about the inputs and valuation methodologies used for the Company’s fair value measurements classified in Level 3 as of December 31, 2016 and 2017:

	Valuation Methodology	Significant Unobservable Input	WeightedAverage (range, if applicable)
Contingent  consideration	Probabilityweighted income approach	Milestone dates	2018 to2020
		Discount rate Probabilityofoccurrence	7.5% to 12% 100%

Change in Fair Value for All Assets and Liabilities Using Unobservable Level 3 Inputs As Determined By Level 3 Inputs

The following table summarizes the change in fair value, as determined by Level 3 inputs, for all assets and liabilities using unobservable Level 3 inputs for the years ended December 31, 2017, 2016 and 2015:

	Fair Value Measurementat Reporting Date (Level 3)
	(In thousands)
	Common stock			Contingent
	warrants			consideration
Balance at December 31, 2014	$	—		$	—
Additions for contingent consideration		—			23,900
Change in fair value		—			(400	)
Balance at December 31, 2015		—			23,500
Payment for contingent consideration		—			(1,182	)
Change in fair value		—			482
Balance at December 31, 2016		—			22,800
Issuance of common stock in exchange for contingent consideration		—			(5,227	)
Issuance of warrants		8,715			—
Payment for contingent consideration		—			(7,181	)
Exercise of warrants		(78,359	)		—
Change in fair value		83,734			2,026
Balance at December 31, 2017		14,090		$	12,418
Current portion		—			719
Long-term portion		14,090			11,699
Balance at December 31, 2017	$	14,090		$	12,418