Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Net revenue	$ 22,162	$ 18,120
Gross profit	$ 7,692	$ 7,500
Gross profit margin	35.00%	41.00%
Operating expenses:
Research and development	$ 2,337	$ 2,596
Selling and marketing	4,064	4,497
General and administrative	2,125	2,191
Restructuring and severance	388	65
Total operating expenses	8,914	9,349
Loss from operations	(1,222)	(1,849)
Non-operating income (expense):
Interest expense, net	(245)	(252)
Foreign currency gains (losses), net	46	86
Loss before income tax provision	(1,421)	(2,015)
Identity
Segment Reporting Information [Line Items]
Net revenue	13,658	9,886
Gross profit	$ 3,359	$ 2,974
Gross profit margin	25.00%	30.00%
Premises
Segment Reporting Information [Line Items]
Net revenue	$ 8,504	$ 8,234
Gross profit	$ 4,333	$ 4,526
Gross profit margin	51.00%	55.00%