Liquidity and Management's Plans - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Liquidity And Managements Plans [Abstract]
Cash and cash equivalents	$ 57,464	$ 67,655	$ 83,560	$ 70,472
Cash used	(26,096)	$ (2,817)
Stockholders' equity	$ 6,659		$ 31,696