Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 60,219	$ 56,168
Gross profit	$ 22,160	$ 23,729
Gross profit margin	37.00%	42.00%
Operating expenses:
Research and development	$ 6,146	$ 6,520
Selling and marketing	13,452	14,032
General and administrative	7,241	11,309
Restructuring and severance	(49)	3,088
Total operating expenses	26,790	34,949
Loss from operations	(4,630)	(11,220)
Non-operating income (expense):
Interest expense, net	(2,590)	(2,378)
Loss on extinguishment of debt	(788)
Foreign currency (losses) gains, net	(358)	27
Loss before income taxes and noncontrolling interest	(8,366)	(13,571)
Premises
Segment Reporting Information [Line Items]
Net revenue	24,154	24,696
Gross profit	$ 13,669	$ 14,034
Gross profit margin	57.00%	57.00%
Identity
Segment Reporting Information [Line Items]
Net revenue	$ 14,293	$ 12,902
Gross profit	$ 5,117	$ 5,015
Gross profit margin	36.00%	39.00%
Credentials
Segment Reporting Information [Line Items]
Net revenue	$ 21,772	$ 17,992
Gross profit	$ 3,374	$ 4,427
Gross profit margin	15.00%	25.00%
All Other
Segment Reporting Information [Line Items]
Net revenue		$ 578
Gross profit		$ 253
Gross profit margin		44.00%