Other Current Assets - Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 2,186	$ 750
Advances to vendors	1,806	2,701
Other receivables	1,343	536
Total	$ 5,335	$ 3,987