Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued Liabilities, Current [Abstract]
Taxes and other assessments	$ 3,023	$ 189
Compensation and benefits	1,713	1,036
Legal and professional fees	594	145
Consulting and other vendors	324	208
Interest and final payment fee	220	131
Deferred rent	230	46
Other	56	14
Total accrued expenses	$ 6,160	$ 1,769