Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets measured at fair value
Cash and cash equivalents	$ 22,106	$ 21,061
Restricted cash	698	590
Total Assets measured at fair value	22,804	21,651
Liabilities measured at fair value
Contingent consideration	948	10,637
Warrant liabilities	1,600	4,636
Total liabilities measured at fair value	2,548	15,273
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets measured at fair value
Cash and cash equivalents	22,106	21,061
Restricted cash	698	590
Total Assets measured at fair value	22,804	21,651
Significant Unobservable Inputs (Level 3)
Liabilities measured at fair value
Contingent consideration	948	10,637
Warrant liabilities	1,600	4,636
Total liabilities measured at fair value	$ 2,548	$ 15,273