Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities and Other Liabilities [Abstract]
Employee compensation and benefits	$ 725	$ 528
Clinical development expenses	225	186
Professional fees	126	165
Research and development costs	20	118
Other	10	5
Total accrued expenses	$ 1,106	$ 1,002