Summary Information by Segment (Detail) (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
Segment Reporting Information [Line Items]
Net revenue	$ 19,912	$ 21,203	$ 18,540	$ 15,955	$ 21,044	$ 17,155	$ 17,849	$ 16,313	$ 75,610	$ 72,361	$ 77,637
Gross profit	8,750	10,014	8,123	6,753	8,840	7,837	7,914	7,412	33,640	32,003	35,279
Gross profit %									44.00%	44.00%	45.00%
Operating Segments | Identity Management
Segment Reporting Information [Line Items]
Net revenue									23,897	31,911	31,402
Gross profit									14,611	18,743	18,033
Gross profit %									61.00%	59.00%	57.00%
Operating Segments | Identity Management | Revenues from external customers
Segment Reporting Information [Line Items]
Net revenue									23,897	31,911	31,402
Operating Segments | Identity Management | Intersegment revenue
Segment Reporting Information [Line Items]
Net revenue									84	26	375
Operating Segments | Identity Management | Total Identity Management revenue
Segment Reporting Information [Line Items]
Net revenue									23,981	31,937	31,777
Operating Segments | ID Products
Segment Reporting Information [Line Items]
Net revenue									51,713	40,450	46,235
Gross profit									19,029	13,260	17,246
Gross profit %									37.00%	33.00%	37.00%
Operating Segments | ID Products | Revenues from external customers
Segment Reporting Information [Line Items]
Net revenue									51,713	40,450	46,235
Operating Segments | ID Products | Intersegment revenue
Segment Reporting Information [Line Items]
Net revenue									667	833	5,304
Operating Segments | ID Products | Total Identity Management revenue
Segment Reporting Information [Line Items]
Net revenue									52,380	41,283	51,539
Elimination of intersegment revenues | Identity Management
Segment Reporting Information [Line Items]
Net revenue									(84)	(26)	(375)
Elimination of intersegment revenues | ID Products
Segment Reporting Information [Line Items]
Net revenue									$ (667)	$ (833)	$ (5,304)