Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accrued Liabilities Current [Abstract]
Employee compensation	$ 2,661	$ 2,796
Other accrued expenses	1,451	1,191
Total	$ 4,112	$ 3,987