Information Regarding Net Revenue and Gross Profit by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Net revenue	$ 22,301	$ 18,182	$ 39,155	$ 33,836
Gross profit	8,930	8,048	15,532	14,762
Gross profit %	40.00%	44.00%	40.00%	44.00%
Operating Segments | Premises
Segment Reporting Information [Line Items]
Net revenue	4,620	4,251	8,087	9,235
Gross profit	2,839	2,778	4,983	5,929
Gross profit %	61.00%	65.00%	62.00%	64.00%
Operating Segments | Identity
Segment Reporting Information [Line Items]
Net revenue	3,768	4,934	8,788	9,488
Gross profit	1,847	2,491	4,084	4,138
Gross profit %	49.00%	50.00%	46.00%	44.00%
Operating Segments | Credentials
Segment Reporting Information [Line Items]
Net revenue	13,171	7,977	20,332	13,155
Gross profit	3,796	2,525	5,402	4,151
Gross profit %	29.00%	32.00%	27.00%	32.00%
Operating Segments | Other Business Segment
Segment Reporting Information [Line Items]
Net revenue	742	1,020	1,948	1,958
Gross profit	$ 448	$ 254	$ 1,063	$ 544
Gross profit %	60.00%	25.00%	55.00%	28.00%