Accrued Expenses - Components of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Development costs	$ 931	$ 834
Employee compensation	573	874
Professional fees	194	195
Interest	88	84
Other	8	0
Total Accrued Expenses	$ 1,794	$ 1,987