Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Depreciation expense	$ 1,673	$ 1,348	$ 886
Accumulated computer software amortization	4,742	2,803
Computer software amortization	$ 731	$ 250