Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Assets measured at fair value
Cash and cash equivalents	$ 24,483	$ 24,165
Restricted cash	6,386	10,425
Total Assets measured at fair value	30,869	34,590
Liabilities measured at fair value
Contingent consideration	18,404	22,800
Warrant liabilities	31,156
Total liabilities measured at fair value	49,560	22,800
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets measured at fair value
Cash and cash equivalents	24,483	24,165
Restricted cash	6,386	10,425
Total Assets measured at fair value	30,869	34,590
Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Contingent consideration	18,404	22,800
Warrant liabilities	31,156
Total liabilities measured at fair value	$ 49,560	$ 22,800