Fair Value (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Measurements Disclosure [Line Items]

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 March 31, 2019 and December 31, 2018, using quoted prices in active markets for identical assets (Level 1); significant other observable inputs (Level 2); and significant unobservable inputs (Level 3):

	March 31, 2019
	(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	$	25,545	$	—	$	—	$	25,545
Restricted cash		578		—		—		578
Total Assets measured at fair value	$	26,123	$	—	$	—	$	26,123
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	11,635	$	11,635
Warrant liabilities		—		—	$	4,742	$	4,742
Total liabilities measured at fair value	$	—	$	—	$	16,377	$	16,377

	December 31, 2018
	(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	$	21,061	$	—	$	—	$	21,061
Restricted cash		590		—		—		590
Total Assets measured at fair value	$	21,651	$	—	$	—	$	21,651
Liabilities measured at fair value
Contingent consideration	$	—	$	—	$	10,637	$	10,637
Warrant liabilities		—		—		4,636		4,636
Total liabilities measured at fair value	$	—	$	—	$	15,273	$	15,273

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 three months ended March 31, 2019:

	Fair Value Measurementat Reporting Date (Level 3)
	(In thousands)
	(unaudited)
	Common stock		Contingent
	warrants		consideration
Balance at December 31, 2018	$	4,636	$	10,637
Change in fair value		106		998
Balance at March 31, 2019	$	4,742	$	11,635
Current portion		—		70
Long-term portion		4,742		11,565
Balance at March 31, 2019	$	4,742	$	11,635

Level 3 [Member]

Fair Value Measurements Disclosure [Line Items]

Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classification

The following table presents quantitative information about the inputs and valuation methodologies used for the Company’s fair value measurements classified in Level 3 with the exception of the warrant liability, which is explained above as of March 31, 2019 and December 31, 2018:

	Valuation Methodology	Significant Unobservable Input	WeightedAverage (range, if applicable)
Contingent  consideration	Probabilityweighted income approach	Milestone dates	2019 to2022
		Discount rate	10% to 12%

Series B Warrant [Member]

Fair Value Measurements Disclosure [Line Items]

Quantitative Information about Inputs and Valuation Methodologies Used for Fair Value Measurements Classification

The following table presents the inputs and valuation methodologies used for the Company’s fair value of the Series B Warrants

					April 28, 2017
Series B	March 31, 2019		December 31, 2018		(date of issuance)
Fair value	$4.7 million		$4.6 million		$6.2 million
Valuation methodology	Monte Carlo		Monte Carlo		Black-Scholes Merton
Term	3.08 years		3.32 years		5 years
Risk free rate	2.21%		2.47%		1.81%
Dividends		—		—		—
Volatility	82.37%		87.60%		73.14%
Share price	$	2.38	$	2.26	$	0.65
Probability of additional financing	100% in 2019		100% in 2019		Not Applicable