Revenues - Schedule Of Contract Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Current	$ 76,141	$ 70,401
Long-Term	58,003	54,881
Total	134,144	125,282
TASER Weapons
Disaggregation of Revenue [Line Items]
Current	15,884	16,665
Long-Term	29,498	30,020
Total	45,382	46,685
Software and Sensors
Disaggregation of Revenue [Line Items]
Current	60,257	53,736
Long-Term	28,505	24,861
Total	88,762	78,597
Warranty:
Disaggregation of Revenue [Line Items]
Current	18,542	18,794
Long-Term	22,718	22,814
Total	41,260	41,608
Warranty: | TASER Weapons
Disaggregation of Revenue [Line Items]
Current	11,601	12,501
Long-Term	17,058	18,619
Total	28,659	31,120
Warranty: | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	6,941	6,293
Long-Term	5,660	4,195
Total	12,601	10,488
Hardware:
Disaggregation of Revenue [Line Items]
Current	18,435	21,120
Long-Term	27,637	26,182
Total	46,072	47,302
Hardware: | TASER Weapons
Disaggregation of Revenue [Line Items]
Current	4,283	4,164
Long-Term	12,440	11,401
Total	16,723	15,565
Hardware: | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	14,152	16,956
Long-Term	15,197	14,781
Total	29,349	31,737
Software and Sensors Services | Software and Sensors
Disaggregation of Revenue [Line Items]
Current	39,164	30,487
Long-Term	7,648	5,885
Total	$ 46,812	$ 36,372