Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 42,612	$ 42,366
Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk percentage	100.00%	100.00%
United States
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 30,889	$ 29,869
United States | Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk percentage	72.50%	70.50%
Total International
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 11,723	$ 12,497
Total International | Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk percentage	27.50%	29.50%