Accounts Payable and Other Liabilities - Schedule of Accounts Payable and Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Trade accounts payable	$ 6,860	$ 2,205
Accrued clinical trial fees	1,381	1,666
Accrued compensation and vacation	1,024	692
Accrued professional fees	188	128
Other liabilities	66	101
Accounts payable and other liabilities	$ 9,519	$ 4,792