Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net revenue	$ 24,859	$ 23,026	$ 62,084	$ 64,785
Gross profit	$ 9,885	$ 10,526	$ 25,097	$ 29,113
Gross profit margin	40.00%	46.00%	40.00%	45.00%
Operating expenses:
Research and development	$ 2,380	$ 2,125	$ 7,398	$ 6,229
Selling and marketing	4,245	4,470	12,978	13,689
General and administrative	2,118	2,591	6,460	7,492
Increase (decrease) in fair value of earnout liability		175	(261)	175
Restructuring and severance	163	(87)	1,645	(101)
Total operating expenses	8,906	9,274	28,220	27,484
Income (loss) from operations	979	1,252	(3,123)	1,629
Non-operating income (expense):
Interest expense, net	(407)	(246)	(1,066)	(766)
Foreign currency (losses) gains, net	(175)	168	(119)	96
Income (loss) before income tax provision	397	1,174	(4,308)	959
Premises
Segment Reporting Information [Line Items]
Net revenue	9,430	12,938	25,146	32,939
Gross profit	$ 5,191	$ 7,212	$ 13,810	$ 17,573
Gross profit margin	55.00%	56.00%	55.00%	53.00%
Identity
Segment Reporting Information [Line Items]
Net revenue	$ 15,429	$ 10,088	$ 36,938	$ 31,846
Gross profit	$ 4,694	$ 3,314	$ 11,287	$ 11,540
Gross profit margin	30.00%	33.00%	31.00%	36.00%