Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 78,142	$ 60,219
Gross profit	$ 33,332	$ 22,160
Gross profit margin	43.00%	37.00%
Operating expenses:
Research and development	$ 7,235	$ 6,146
Selling and marketing	16,391	13,452
General and administrative	10,824	7,241
Restructuring and severance	747	(49)
Total operating expenses	35,197	26,790
Loss from operations	(1,865)	(4,630)
Non-operating income (expense):
Interest expense, net	(1,518)	(2,590)
Loss on extinguishment of debt, net	(1,369)	(788)
Foreign currency gains (losses), net	204	(358)
Loss before income taxes and noncontrolling interest	(4,548)	(8,366)
Premises
Segment Reporting Information [Line Items]
Net revenue	34,587	24,154
Gross profit	$ 19,373	$ 13,669
Gross profit margin	56.00%	57.00%
Identity
Segment Reporting Information [Line Items]
Net revenue	$ 43,555	$ 36,065
Gross profit	$ 13,959	$ 8,491
Gross profit margin	32.00%	24.00%