Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net revenue	$ 112,915,000	$ 103,769,000	$ 86,920,000
Gross profit	$ 40,944,000	$ 37,067,000	$ 33,681,000
Gross profit margin	36.00%	36.00%	39.00%
Operating expenses:
Research and development	$ 9,916,000	$ 8,673,000	$ 9,781,000
Selling and marketing	20,730,000	17,033,000	17,270,000
General and administrative	10,429,000	11,891,000	8,623,000
Decrease in fair value of earnout liability			(261,000)
Restructuring and severance	202,000	817,000	1,716,000
Total operating expenses	41,277,000	38,414,000	37,129,000
Loss from operations	(333,000)	(1,347,000)	(3,448,000)
Non-operating income (expense):
Interest expense, net	(143,000)	(483,000)	(1,462,000)
Gain on forgiveness of Paycheck Protection Program note		2,946,000
Gain on investment	30,000	611,000
Foreign currency gains (losses), net	155,000	(79,000)	(122,000)
Income (loss) before income tax provision	(291,000)	1,648,000	(5,032,000)
Identity
Segment Reporting Information [Line Items]
Net revenue	67,422,000	64,725,000	52,742,000
Gross profit	$ 15,153,000	$ 15,670,000	$ 14,781,000
Gross profit margin	22.00%	24.00%	28.00%
Premises
Segment Reporting Information [Line Items]
Net revenue	$ 45,493,000	$ 39,044,000	$ 34,178,000
Gross profit	$ 25,791,000	$ 21,397,000	$ 18,900,000
Gross profit margin	57.00%	55.00%	55.00%