Summary of Company's Net Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 56,168	$ 60,794
Tags and transponders
Segment Reporting Information [Line Items]
Net revenue	10,890	20,310
Logical and physical access control readers
Segment Reporting Information [Line Items]
Net revenue	17,671	17,165
Controller panels
Segment Reporting Information [Line Items]
Net revenue	14,908	10,272
Access cards and provisioning
Segment Reporting Information [Line Items]
Net revenue	7,106	7,394
Third party access control products
Segment Reporting Information [Line Items]
Net revenue	1,645	1,523
Other
Segment Reporting Information [Line Items]
Net revenue	$ 3,948	$ 4,130