Revenues - Schedule Of Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Current	$ 113,351	$ 107,016
Long-Term	74,586	74,417
Total	187,937	181,433
TASER
Disaggregation of Revenue [Line Items]
Current	14,502	22,152
Long-Term	32,644	32,445
Total	47,146	54,597
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	98,849	84,864
Long-Term	41,942	41,972
Total	140,791	126,836
Warranty
Disaggregation of Revenue [Line Items]
Current	20,624	21,070
Long-Term	21,348	23,363
Total	41,972	44,433
Warranty | TASER
Disaggregation of Revenue [Line Items]
Current	11,110	12,797
Long-Term	16,450	16,847
Total	27,560	29,644
Warranty | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	9,514	8,273
Long-Term	4,898	6,516
Total	14,412	14,789
Hardware
Disaggregation of Revenue [Line Items]
Current	38,758	30,233
Long-Term	39,344	40,283
Total	78,102	70,516
Hardware | TASER
Disaggregation of Revenue [Line Items]
Current	3,315	9,355
Long-Term	15,844	15,598
Total	19,159	24,953
Hardware | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	35,443	20,878
Long-Term	23,500	24,685
Total	58,943	45,563
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	53,969	55,713
Long-Term	13,894	10,771
Total	67,863	66,484
Software and Sensors | TASER
Disaggregation of Revenue [Line Items]
Current	77	0
Long-Term	350	0
Total	427	0
Software and Sensors | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	53,892	55,713
Long-Term	13,544	10,771
Total	$ 67,436	$ 66,484