Deferred Revenue - Summary of Deferred Revenue (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Current	$ 70,401	$ 45,137
Long-Term	54,881	40,054
Total	125,282	85,191
Warranty
Deferred Revenue Arrangement [Line Items]
Current	18,794	13,959
Long-Term	22,814	20,245
Total	41,608	34,204
Hardware
Deferred Revenue Arrangement [Line Items]
Current	21,120	11,552
Long-Term	26,182	15,595
Total	47,302	27,147
AXON services
Deferred Revenue Arrangement [Line Items]
Current	30,487	19,626
Long-Term	5,885	4,214
Total	36,372	23,840
TASER Weapons
Deferred Revenue Arrangement [Line Items]
Current	16,665	11,682
Long-Term	30,020	21,709
Total	46,685	33,391
TASER Weapons | Warranty
Deferred Revenue Arrangement [Line Items]
Current	12,501	9,980
Long-Term	18,619	17,319
Total	31,120	27,299
TASER Weapons | Hardware
Deferred Revenue Arrangement [Line Items]
Current	4,164	1,702
Long-Term	11,401	4,390
Total	15,565	6,092
Software and Sensors
Deferred Revenue Arrangement [Line Items]
Current	53,736	33,455
Long-Term	24,861	18,345
Total	78,597	51,800
Software and Sensors | Warranty
Deferred Revenue Arrangement [Line Items]
Current	6,293	3,979
Long-Term	4,195	2,926
Total	10,488	6,905
Software and Sensors | Hardware
Deferred Revenue Arrangement [Line Items]
Current	16,956	9,850
Long-Term	14,781	11,205
Total	$ 31,737	$ 21,055