Deferred Revenue - Summary of Deferred Revenue (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Current	$ 52,562	$ 45,137
Long-Term	47,608	40,054
Total	100,170	85,191
Warranty
Deferred Revenue Arrangement [Line Items]
Current	15,114	13,959
Long-Term	21,601	20,245
Total	36,715	34,204
Hardware
Deferred Revenue Arrangement [Line Items]
Current	13,022	11,552
Long-Term	21,669	15,595
Total	34,691	27,147
Software and Sensor Services
Deferred Revenue Arrangement [Line Items]
Current	24,426	19,626
Long-Term	4,338	4,214
Total	28,764	23,840
TASER Weapons
Deferred Revenue Arrangement [Line Items]
Current	12,744	11,682
Long-Term	27,110	21,709
Total	39,854	33,391
TASER Weapons | Warranty
Deferred Revenue Arrangement [Line Items]
Current	9,630	9,980
Long-Term	17,346	17,319
Total	26,976	27,299
TASER Weapons | Hardware
Deferred Revenue Arrangement [Line Items]
Current	3,114	1,702
Long-Term	9,764	4,390
Total	12,878	6,092
Software and Sensors
Deferred Revenue Arrangement [Line Items]
Current	39,818	33,455
Long-Term	20,498	18,345
Total	60,316	51,800
Software and Sensors | Warranty
Deferred Revenue Arrangement [Line Items]
Current	5,484	3,979
Long-Term	4,255	2,926
Total	9,739	6,905
Software and Sensors | Hardware
Deferred Revenue Arrangement [Line Items]
Current	9,908	9,850
Long-Term	11,905	11,205
Total	$ 21,813	$ 21,055