Revenues - Schedule Of Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Current	$ 76,583	$ 71,264	$ 70,401
Long-Term	61,456	$ 56,130	54,881
Total	138,039		125,282
TASER Weapons
Disaggregation of Revenue [Line Items]
Current	17,857		16,665
Long-Term	31,295		30,020
Total	49,152		46,685
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	58,726		53,736
Long-Term	30,161		24,861
Total	88,887		78,597
Warranty:
Disaggregation of Revenue [Line Items]
Current	18,594		18,794
Long-Term	22,059		22,814
Total	40,653		41,608
Warranty: | TASER Weapons
Disaggregation of Revenue [Line Items]
Current	11,593		12,501
Long-Term	16,508		18,619
Total	28,101		31,120
Warranty: | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	7,001		6,293
Long-Term	5,551		4,195
Total	12,552		10,488
Hardware:
Disaggregation of Revenue [Line Items]
Current	22,195		21,120
Long-Term	30,166		26,182
Total	52,361		47,302
Hardware: | TASER Weapons
Disaggregation of Revenue [Line Items]
Current	6,264		4,164
Long-Term	14,787		11,401
Total	21,051		15,565
Hardware: | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	15,931		16,956
Long-Term	15,379		14,781
Total	31,310		31,737
Software and Sensors Services | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	35,794		30,487
Long-Term	9,231		5,885
Total	$ 45,025		$ 36,372