Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property and Equipment [Line Items]
Computer software development costs capitalized	$ 3,500	$ 2,000	$ 6,400	$ 3,700
Retainage amount included in construction in progress	1,200		1,200		$ 1,100
Interest cost paid	400	200	800	500
Interest costs capitalized	100	200	200	200
Depreciation and amortization	2,440	1,823	4,666	3,546
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 4,300	$ 2,800	$ 8,200	$ 5,300