Deferred Revenue - Summary of Deferred Revenue (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Current	$ 49,909	$ 45,137
Long-Term	41,644	40,054
Total	91,553	85,191
Warranty
Deferred Revenue Arrangement [Line Items]
Current	15,769	13,959
Long-Term	20,436	20,245
Total	36,205	34,204
Hardware
Deferred Revenue Arrangement [Line Items]
Current	12,970	11,552
Long-Term	16,926	15,595
Total	29,896	27,147
Software and Sensor Services
Deferred Revenue Arrangement [Line Items]
Current	21,170	19,626
Long-Term	4,282	4,214
Total	25,452	23,840
TASER Weapons
Deferred Revenue Arrangement [Line Items]
Current	13,959	11,682
Long-Term	25,465	21,709
Total	39,424	33,391
TASER Weapons | Warranty
Deferred Revenue Arrangement [Line Items]
Current	11,368	9,980
Long-Term	17,288	17,319
Total	28,656	27,299
TASER Weapons | Hardware
Deferred Revenue Arrangement [Line Items]
Current	2,591	1,702
Long-Term	8,177	4,390
Total	10,768	6,092
Software and Sensors
Deferred Revenue Arrangement [Line Items]
Current	35,950	33,455
Long-Term	16,179	18,345
Total	52,129	51,800
Software and Sensors | Warranty
Deferred Revenue Arrangement [Line Items]
Current	4,401	3,979
Long-Term	3,148	2,926
Total	7,549	6,905
Software and Sensors | Hardware
Deferred Revenue Arrangement [Line Items]
Current	10,379	9,850
Long-Term	8,749	11,205
Total	$ 19,128	$ 21,055