Prepaid Expenses - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 1,729	$ 287
Prepaid insurance	98	92
Prepaid R&D clinical costs	1,500	177
Other costs	35	$ 18
Prepaid rent	$ 96