Income Taxes - Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes and before the Gain from Sale of Equity Method Investment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Domestic	$ (6,034)	$ 1,373	$ (14,223)
Foreign	4	(1,615)	(272)
Loss before income taxes	$ (6,030)	$ (242)	$ (14,495)