Fair Value - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Assets measured at fair value
Cash and cash equivalents	$ 24,165	$ 38,449
Restricted cash	10,425
Total	34,590	38,449
Liabilities measured at fair value
Contingent consideration	22,800	23,500
Total liabilities measured at fair value	22,800	23,500
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets measured at fair value
Cash and cash equivalents	24,165	38,449
Restricted cash	10,425
Total	34,590	38,449
Significant Unobservable Inputs (Level 3) [Member]
Liabilities measured at fair value
Contingent consideration	22,800	23,500
Total liabilities measured at fair value	$ 22,800	$ 23,500