Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net revenue	$ 23,026	$ 20,022	$ 64,785	$ 56,844
Gross profit	$ 10,526	$ 8,484	$ 29,113	$ 23,145
Gross profit margin	46.00%	42.00%	45.00%	41.00%
Operating expenses:
Research and development	$ 2,125	$ 1,860	$ 6,229	$ 5,384
Selling and marketing	4,470	3,915	13,689	12,176
General and administrative	2,591	2,641	7,492	7,952
Increase in fair value of earnout liability	175		175
Restructuring and severance	(87)	223	(101)	591
Total operating expenses	9,274	8,639	27,484	26,103
Income (loss) from operations	1,252	(155)	1,629	(2,958)
Non-operating income (expense):
Interest expense, net	(246)	(291)	(766)	(1,239)
Loss on extinguishment of debt, net				(1,369)
Foreign currency gains, net	168	200	96	354
Income (loss) before income taxes and noncontrolling interest	1,174	(246)	959	(5,212)
Premises
Segment Reporting Information [Line Items]
Net revenue	12,938	9,364	32,939	25,691
Gross profit	$ 7,212	$ 5,363	$ 17,573	$ 14,336
Gross profit margin	56.00%	57.00%	53.00%	56.00%
Identity
Segment Reporting Information [Line Items]
Net revenue	$ 10,088	$ 10,658	$ 31,846	$ 31,153
Gross profit	$ 3,314	$ 3,121	$ 11,540	$ 8,809
Gross profit margin	33.00%	29.00%	36.00%	28.00%