Revenues - Schedule Of Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Current	$ 89,637	$ 71,264	$ 70,401
Long-Term	69,382	$ 56,130	54,881
Total	159,019		125,282
TASER Weapons
Disaggregation of Revenue [Line Items]
Current	18,645		16,665
Long-Term	34,012		30,020
Total	52,657		46,685
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	70,992		53,736
Long-Term	35,370		24,861
Total	106,362		78,597
Warranty
Disaggregation of Revenue [Line Items]
Current	19,781		18,794
Long-Term	23,280		22,814
Total	43,061		41,608
Warranty | TASER Weapons
Disaggregation of Revenue [Line Items]
Current	11,256		12,501
Long-Term	18,085		18,619
Total	29,341		31,120
Warranty | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	8,525		6,293
Long-Term	5,195		4,195
Total	13,720		10,488
Hardware
Disaggregation of Revenue [Line Items]
Current	25,070		21,120
Long-Term	35,760		26,182
Total	60,830		47,302
Hardware | TASER Weapons
Disaggregation of Revenue [Line Items]
Current	7,389		4,164
Long-Term	15,927		11,401
Total	23,316		15,565
Hardware | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	17,681		16,956
Long-Term	19,833		14,781
Total	37,514		31,737
Software and Sensors Services | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	44,786		30,487
Long-Term	10,342		5,885
Total	$ 55,128		$ 36,372