Accounts Payable and Other Accrued Liabilities - Accounts Payable and Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables And Accruals [Abstract]
Accounts payable	$ 3,340	$ 5,977
Accrued compensation	3,625	4,820
Other accrued liabilities	1,614	1,319
Total accounts payable and other accrued liabilities	$ 8,579	$ 12,116