Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 38,231	$ 37,150	$ 114,380	$ 108,741
Geographic Concentration Risk | Sales
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 38,231	$ 37,150	$ 114,380	$ 108,741
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Geographic Concentration Risk | Sales | United States | Direct
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 26,915	$ 27,067	$ 80,825	$ 79,048
Concentration risk percentage	70.40%	72.90%	70.70%	72.70%
Geographic Concentration Risk | Sales | Europe
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 7,789	$ 6,937	$ 22,923	$ 21,337
Concentration risk percentage	20.40%	18.70%	20.00%	19.60%
Geographic Concentration Risk | Sales | Latin America | Distributor
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 1,908	$ 1,858	$ 5,168	$ 4,085
Concentration risk percentage	5.00%	5.00%	4.50%	3.80%
Geographic Concentration Risk | Sales | Asia/Pacific | Distributor
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 1,619	$ 1,288	$ 5,464	$ 4,271
Concentration risk percentage	4.20%	3.50%	4.80%	3.90%
Geographic Concentration Risk | Sales | Total ROW | Distributor
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 3,527	$ 3,146	$ 10,632	$ 8,356
Concentration risk percentage	9.20%	8.50%	9.30%	7.70%