Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 16,528	$ 13,392
Gross profit	$ 6,508	$ 5,697
Gross profit margin	39.00%	43.00%
Operating expenses:
Research and development	$ 1,687	$ 1,477
Selling and marketing	3,903	3,379
General and administrative	2,555	1,787
Restructuring and severance	110
Total operating expenses	8,255	6,643
Loss from operations	(1,747)	(946)
Non-operating income (expense):
Interest expense, net	(476)	(674)
Gain on extinguishment of debt		977
Foreign currency (losses) gains, net	(38)	(152)
Loss before income taxes and noncontrolling interest	(2,261)	(795)
Premises
Segment Reporting Information [Line Items]
Net revenue	7,506	5,364
Gross profit	$ 4,155	$ 3,099
Gross profit margin	55.00%	58.00%
Identity
Segment Reporting Information [Line Items]
Net revenue	$ 2,780	$ 3,089
Gross profit	$ 929	$ 1,124
Gross profit margin	33.00%	36.00%
Credentials
Segment Reporting Information [Line Items]
Net revenue	$ 6,242	$ 4,935
Gross profit	$ 1,424	$ 1,470
Gross profit margin	23.00%	30.00%
All Other
Segment Reporting Information [Line Items]
Net revenue		$ 4
Gross profit		$ 4
Gross profit margin		100.00%