Accrued Expenses - Components of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Development costs	$ 344	$ 931
Employee compensation	55	573
Professional fees	92	194
Interest	0	88
Other	0	8
Total accrued expenses	$ 491	$ 1,794