Net Revenues by Geographic Location (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 51,200	$ 50,200	$ 43,100	$ 27,600	$ 44,400	$ 37,700	$ 27,300	$ 20,300	$ 172,121	$ 129,656	$ 76,840
United States
Segment Reporting Information [Line Items]
Revenue									172,000	129,300	74,800
Canada
Segment Reporting Information [Line Items]
Revenue									$ 100	300	1,800
Other
Segment Reporting Information [Line Items]
Revenue										$ 100	$ 200