Summary of Company's Net Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 78,142	$ 60,219
Physical access and identity control readers
Segment Reporting Information [Line Items]
Net revenue	21,680	18,601
Controller panels
Segment Reporting Information [Line Items]
Net revenue	14,509	14,637
Access cards and provisioning
Segment Reporting Information [Line Items]
Net revenue	14,237	8,396
Tags and transponders
Segment Reporting Information [Line Items]
Net revenue	12,953	13,089
Video technology and analytics
Segment Reporting Information [Line Items]
Net revenue	6,293
Services
Segment Reporting Information [Line Items]
Net revenue	6,152	3,816
Third party access control products
Segment Reporting Information [Line Items]
Net revenue	1,205	1,014
Software
Segment Reporting Information [Line Items]
Net revenue	$ 1,113	$ 666