Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Employee benefits	$ 4,871	$ 8,375
Professional fees	609	613
Other	1,738	1,636
Total	$ 7,218	$ 10,624