Revenues - Summary of Deferred Revenue (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Current	$ 117,864	$ 107,016
Long-Term	87,936	74,417
Total	205,800	181,433
TASER
Disaggregation of Revenue [Line Items]
Current	22,578	22,152
Long-Term	32,611	32,445
Total	55,189	54,597
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	95,286	84,864
Long-Term	55,325	41,972
Total	150,611	126,836
Warranty
Disaggregation of Revenue [Line Items]
Current	22,568	21,070
Long-Term	21,534	23,363
Total	44,102	44,433
Warranty | TASER
Disaggregation of Revenue [Line Items]
Current	12,716	12,797
Long-Term	16,378	16,847
Total	29,094	29,644
Warranty | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	9,852	8,273
Long-Term	5,156	6,516
Total	15,008	14,789
Hardware
Disaggregation of Revenue [Line Items]
Current	31,804	30,233
Long-Term	49,227	40,283
Total	81,031	70,516
Hardware | TASER
Disaggregation of Revenue [Line Items]
Current	9,569	9,355
Long-Term	15,468	15,598
Total	25,037	24,953
Hardware | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	22,235	20,878
Long-Term	33,759	24,685
Total	55,994	45,563
Services
Disaggregation of Revenue [Line Items]
Current	63,492	55,713
Long-Term	17,175	10,771
Total	80,667	66,484
Services | TASER
Disaggregation of Revenue [Line Items]
Current	293	0
Long-Term	765	0
Total	1,058	0
Services | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	63,199	55,713
Long-Term	16,410	10,771
Total	$ 79,609	$ 66,484