Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets measured at fair value
Cash and cash equivalents	$ 23,302	$ 21,061
Restricted cash	712	590
Total Assets measured at fair value	24,014	21,651
Liabilities measured at fair value
Contingent consideration	12,595	10,637
Warrant liabilities	2,214	4,636
Total liabilities measured at fair value	14,809	15,273
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets measured at fair value
Cash and cash equivalents	23,302	21,061
Restricted cash	712	590
Total Assets measured at fair value	24,014	21,651
Significant Unobservable Inputs (Level 3)
Liabilities measured at fair value
Contingent consideration	12,595	10,637
Warrant liabilities	2,214	4,636
Total liabilities measured at fair value	$ 14,809	$ 15,273