Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net revenue	$ 23,993	$ 19,105	$ 46,155	$ 37,225
Gross profit	$ 8,840	$ 7,712	$ 16,532	$ 15,212
Gross profit margin	37.00%	40.00%	36.00%	41.00%
Operating expenses:
Research and development	$ 2,131	$ 2,422	$ 4,468	$ 5,018
Selling and marketing	4,147	4,236	8,211	8,733
General and administrative	2,595	2,151	4,720	4,342
Decrease in fair value of earnout liability		(261)		(261)
Restructuring and severance	274	1,417	662	1,482
Total operating expenses	9,147	9,965	18,061	19,314
Loss from operations	(307)	(2,253)	(1,529)	(4,102)
Non-operating income (expense):
Interest expense, net	(144)	(407)	(389)	(659)
Gain on forgiveness of Paycheck Protection Program note	2,946		2,946
Foreign currency gains (losses), net		(30)	46	56
Income (loss) before income tax provision	2,495	(2,690)	1,074	(4,705)
Identity
Segment Reporting Information [Line Items]
Net revenue	14,796	11,623	28,454	21,509
Gross profit	$ 3,563	$ 3,619	$ 6,922	$ 6,593
Gross profit margin	24.00%	31.00%	24.00%	31.00%
Premises
Segment Reporting Information [Line Items]
Net revenue	$ 9,197	$ 7,482	$ 17,701	$ 15,716
Gross profit	$ 5,277	$ 4,093	$ 9,610	$ 8,619
Gross profit margin	57.00%	55.00%	54.00%	55.00%