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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets
Money market funds	$ 17,494	$ 13,097
Liabilities
Contingent consideration	1,816	1,672
Common stock warrant liability	13,247	18,712
Derivative liability	0	14,600
Total liabilities	15,063	34,984
Fair Value Measured Using - (Level 1) [Member]
Assets
Money market funds	17,494	13,097
Liabilities
Contingent consideration	0	0
Common stock warrant liability	0	0
Derivative liability	0	0
Total liabilities	0	0
Fair Value Measured Using - (Level 2) [Member]
Assets
Money market funds	0	0
Liabilities
Contingent consideration	0	0
Common stock warrant liability	0	0
Derivative liability	0	0
Total liabilities	0	0
Fair Value Measured Using - (Level 3) [Member]
Assets
Money market funds	0	0
Liabilities
Contingent consideration	1,816	1,672
Common stock warrant liability	13,247	18,712
Derivative liability	0	14,600
Total liabilities	$ 15,063	$ 34,984

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Fair value of contingent consideration in a business combination that is classified in shareholders' equity.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value of financial and nonfinancial obligations.

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