Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 48,556	$ 50,974	$ 91,168	$ 93,340
Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
United States
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 31,906	$ 36,283	$ 62,795	$ 66,151
United States | Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk percentage	65.70%	71.20%	68.90%	70.90%
Total International
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 16,650	$ 14,691	$ 28,373	$ 27,189
Total International | Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk percentage	34.30%	28.80%	31.10%	29.10%