Revenue by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Revenue by Geographic Region [Line Items]
Revenue	$ 35,249	$ 33,260	$ 33,964	$ 29,784	$ 29,222	$ 26,696	$ 25,509	$ 24,519	$ 132,257	$ 105,946	$ 83,417
Europe
Schedule of Revenue by Geographic Region [Line Items]
Revenue									16,101	8,404	4,178
Latin America
Schedule of Revenue by Geographic Region [Line Items]
Revenue									6,118	4,859	4,395
Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Revenue										5,591	3,149
Canada
Schedule of Revenue by Geographic Region [Line Items]
Revenue									39	0	0
IntuiTrak Systems | Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Recognition of Deferred Revenue									7,062
Direct | United States
Schedule of Revenue by Geographic Region [Line Items]
Revenue									102,937	87,092	71,695
Distributor | Total ROW
Schedule of Revenue by Geographic Region [Line Items]
Revenue									$ 13,219	$ 10,450	$ 7,544
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 | Europe
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									12.20%	7.90%	5.00%
Geographic Concentration Risk | Sales | Latin America
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									4.60%	4.60%	5.30%
Geographic Concentration Risk | Sales | Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									5.30%	5.30%	3.80%
Geographic Concentration Risk | Sales | Canada
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									0.00%	0.00%	0.00%
Geographic Concentration Risk | Sales | Direct | United States
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									77.80%	82.20%	85.90%
Geographic Concentration Risk | Sales | Distributor | Total ROW
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									10.00%	9.90%	9.00%