Segment Information and Information about Geographic Area (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segment) | segment			1
Revenues	$ 50,987	$ 42,469	$ 145,701	$ 119,839
Property and equipment, net	40,670		40,670		$ 31,329
United States
Segment Reporting Information [Line Items]
Revenues	35,965	29,993	102,850
Property and equipment, net	32,429		32,429		25,623
Other
Segment Reporting Information [Line Items]
Revenues	15,022	$ 12,476	42,851
Property and equipment, net	$ 8,241		$ 8,241		$ 5,706