Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net revenue	$ 116,383,000	$ 112,915,000	$ 103,769,000
Gross profit	$ 42,164,000	$ 40,944,000	$ 37,067,000
Gross profit margin	36.00%	36.00%	36.00%
Operating expenses:
Research and development	$ 11,590,000	$ 9,916,000	$ 8,673,000
Selling and marketing	22,555,000	20,730,000	17,033,000
General and administrative	12,360,000	10,429,000	11,891,000
Restructuring and severance	714,000	202,000	817,000
Total operating expenses	47,219,000	41,277,000	38,414,000
Loss from operations	(5,055,000)	(333,000)	(1,347,000)
Non-operating income (expense):
Interest expense, net	(427,000)	(143,000)	(483,000)
Gain on forgiveness of Paycheck Protection Program note			2,946,000
Gain on investment	132,000	30,000	611,000
Foreign currency gains (losses), net	25,000	155,000	(79,000)
Income (loss) before income tax provision	(5,325,000)	(291,000)	1,648,000
Identity | Operating Segments
Segment Reporting Information [Line Items]
Net revenue	68,117,000	67,422,000	64,725,000
Gross profit	$ 14,679,000	$ 15,153,000	$ 15,670,000
Gross profit margin	22.00%	22.00%	24.00%
Premises | Operating Segments
Segment Reporting Information [Line Items]
Net revenue	$ 48,266,000	$ 45,493,000	$ 39,044,000
Gross profit	$ 27,485,000	$ 25,791,000	$ 21,397,000
Gross profit margin	57.00%	57.00%	55.00%