Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued Liabilities, Current [Abstract]
Payroll and related benefits	$ 5,493	$ 6,620
Professional fees	1,076	480
Royalties	618	2,285
Other	2,120	1,747
Accrued Expenses, Total	$ 9,307	$ 11,132