Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 39,232	$ 38,231	$ 39,479	$ 36,671	$ 38,847	$ 37,150	$ 38,327	$ 33,264	$ 153,612	$ 147,588	$ 132,257
United States
Schedule of Revenue by Geographic Region [Line Items]
Revenue									107,228	106,052	102,937
Europe
Schedule of Revenue by Geographic Region [Line Items]
Revenue									31,089	29,131	16,101
Total ROW
Schedule of Revenue by Geographic Region [Line Items]
Revenue									15,295	12,405	13,219
Latin America
Schedule of Revenue by Geographic Region [Line Items]
Revenue									6,589	6,509	6,118
Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Revenue									8,706	5,896	7,062
Canada
Schedule of Revenue by Geographic Region [Line Items]
Revenue									$ 0	$ 0	$ 39
Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk, percentage									100.00%	100.00%	100.00%
Geographic Concentration Risk | Sales | United States
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk, percentage									69.80%	71.90%	77.80%
Geographic Concentration Risk | Sales | Europe
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk, percentage									20.20%	19.70%	12.20%
Geographic Concentration Risk | Sales | Total ROW
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk, percentage									10.00%	8.40%	10.00%
Geographic Concentration Risk | Sales | Latin America
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk, percentage									4.30%	4.40%	4.60%
Geographic Concentration Risk | Sales | Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk, percentage									5.70%	4.00%	5.30%
Geographic Concentration Risk | Sales | Canada
Schedule of Revenue by Geographic Region [Line Items]
Concentration risk, percentage									0.00%	0.00%	0.00%