Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued sales and marketing costs	$ 11,928	$ 5,963
Accrued compensation and benefits	11,217	9,201
Accrued manufacturing costs	1,732	1,307
Accrued rent obligations	664	1,372
Other	3,350	2,817
Total accrued expenses	$ 28,891	$ 20,660