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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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