Geographic Information (Details) - 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
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 49,299	$ 53,889	$ 51,984	$ 61,902	$ 52,912	$ 44,921	$ 45,087	$ 47,435	$ 217,074	$ 190,355	$ 159,289
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									193,054	164,952	136,478
Americas, excluding U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,562	4,552	4,883
Europe, Middle East, India, Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									14,256	15,437	13,098
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 7,202	$ 5,414	$ 4,830