Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Property and Equipment [Line Items]
Computer software development costs capitalized	$ 2,900	$ 1,700
Retainage amount included in construction in progress	900		$ 1,100
Interest cost paid	400	300
Interest costs capitalized	100	100
Depreciation and amortization	2,226	1,723
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 3,900	$ 2,500