Revenue by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012 region	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 region	Dec. 31, 2011	Dec. 31, 2010
Schedule of Revenue by Geographic Region [Line Items]
Number of Sales Regions	12								12
Revenue	$ 29,222	$ 26,696	$ 25,509	$ 24,519	$ 23,392	$ 22,302	$ 19,175	$ 18,548	$ 105,946	$ 83,417	$ 67,251
Europe
Schedule of Revenue by Geographic Region [Line Items]
Number of Independent Distributors									5
Revenue									8,404	4,178	4,402
Latin America
Schedule of Revenue by Geographic Region [Line Items]
Revenue									4,859	4,395	4,072
Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Revenue										3,149	3,334
IntuiTrak Systems | Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Revenue									5,591
Direct | United States
Schedule of Revenue by Geographic Region [Line Items]
Revenue									87,092	71,695	55,443
Distributor | Total ROW
Schedule of Revenue by Geographic Region [Line Items]
Revenue									$ 10,450	$ 7,544	$ 7,406
Geographic Concentration Risk [Member] | Sales [Member]
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] | Sales [Member] | Europe
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									7.90%	5.00%	6.50%
Geographic Concentration Risk [Member] | Sales [Member] | Latin America
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									4.60%	5.30%	6.10%
Geographic Concentration Risk [Member] | Sales [Member] | Asia/Pacific
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									5.30%	3.80%	5.00%
Geographic Concentration Risk [Member] | Sales [Member] | Direct | United States
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									82.20%	85.90%	82.40%
Geographic Concentration Risk [Member] | Sales [Member] | Distributor | Total ROW
Schedule of Revenue by Geographic Region [Line Items]
Concentration Risk, Percentage									9.90%	9.00%	11.00%