Information Regarding Net Revenue and Gross Profit by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 15,432	$ 15,560	$ 43,664	$ 41,521
Gross profit	$ 5,861	$ 6,920	$ 17,241	$ 17,483
Gross profit margin	38.00%	44.00%	39.00%	42.00%
Operating expenses:
Research and development	$ 1,597	$ 1,480	$ 4,584	$ 4,997
Selling and marketing	3,448	3,312	10,142	10,807
General and administrative	1,247	2,115	5,119	9,674
Restructuring and severance	(49)	160	(49)	3,100
Total operating expenses	6,243	7,067	19,796	28,578
Loss from operations	(382)	(147)	(2,555)	(11,095)
Non-operating income (expense):
Interest expense, net	(643)	(525)	(1,995)	(1,814)
Gain on extinguishment of debt			977
Foreign currency (losses) gains, net	(51)	35	(202)	309
Loss before income taxes and noncontrolling interest	(1,076)	(637)	(3,775)	(12,600)
PACS
Segment Reporting Information [Line Items]
Net revenue	6,434	7,253	17,622	17,908
Gross profit	$ 3,412	$ 4,334	$ 9,556	$ 10,244
Gross profit margin	53.00%	60.00%	54.00%	57.00%
Identity
Segment Reporting Information [Line Items]
Net revenue	$ 3,421	$ 3,508	$ 10,568	$ 8,923
Gross profit	$ 1,229	$ 1,359	$ 3,666	$ 3,324
Gross profit margin	36.00%	39.00%	35.00%	37.00%
Credentials
Segment Reporting Information [Line Items]
Net revenue	$ 5,577	$ 4,799	$ 15,471	$ 14,110
Gross profit	$ 1,220	$ 1,227	$ 4,013	$ 3,654
Gross profit margin	22.00%	26.00%	26.00%	26.00%
All Other
Segment Reporting Information [Line Items]
Net revenue			$ 3	$ 580
Gross profit			$ 6	$ 261
Gross profit margin			200.00%	45.00%