Accrued Expenses - Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 9,360	$ 9,201
Accrued sales and marketing	7,757	5,963
Income taxes payable	6,325
Accrued manufacturing expenses	1,407	1,307
Accrued rent obligations	1,127	1,372
Other	2,488	2,817
Total accrued expenses	$ 28,464	$ 20,660