Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Sales and marketing costs	$ 16,707	$ 11,928
Compensation and benefits	13,298	11,217
Manufacturing costs	1,799	1,732
Rent obligations	632	664
Other	2,257	3,350
Total accrued expenses	$ 34,693	$ 28,891