Revenues - Schedule Of Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Current	$ 127,160	$ 107,016
Long-Term	82,149	74,417
Total	209,309	181,433
TASER
Disaggregation of Revenue [Line Items]
Current	16,066	22,152
Long-Term	34,630	32,445
Total	50,696	54,597
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	111,094	84,864
Long-Term	47,519	41,972
Total	158,613	126,836
Warranty
Disaggregation of Revenue [Line Items]
Current	21,576	21,070
Long-Term	22,083	23,363
Total	43,659	44,433
Warranty | TASER
Disaggregation of Revenue [Line Items]
Current	11,677	12,797
Long-Term	16,633	16,847
Total	28,310	29,644
Warranty | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	9,899	8,273
Long-Term	5,450	6,516
Total	15,349	14,789
Hardware
Disaggregation of Revenue [Line Items]
Current	43,686	30,233
Long-Term	44,958	40,283
Total	88,644	70,516
Hardware | TASER
Disaggregation of Revenue [Line Items]
Current	4,378	9,355
Long-Term	17,601	15,598
Total	21,979	24,953
Hardware | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	39,308	20,878
Long-Term	27,357	24,685
Total	66,665	45,563
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	61,898	55,713
Long-Term	15,108	10,771
Total	77,006	66,484
Software and Sensors | TASER
Disaggregation of Revenue [Line Items]
Current	11	0
Long-Term	396	0
Total	407	0
Software and Sensors | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	61,887	55,713
Long-Term	14,712	10,771
Total	$ 76,599	$ 66,484