Goodwill and Intangible Assets - Definite-Lived Intangible Assets Other than Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets [Line Items]
Gross Carrying Amount	$ 24,372	$ 24,438
Accumulated Amortization	(16,432)	(13,409)
Total	7,940	11,029
Not amortized, Gross Carrying Amount	1,508	1,742
Intangible assets, Gross Carrying Amount	25,880	26,180
Intangible assets, Net Carrying Amount	9,448	12,771
Amortization expense of intangible assets	3,300	3,500	$ 5,700
TASER trademark
Intangible Assets [Line Items]
Not amortized, Gross Carrying Amount	900	900
Patents and trademarks pending
Intangible Assets [Line Items]
Not amortized, Gross Carrying Amount	608	842
Domain names
Intangible Assets [Line Items]
Gross Carrying Amount	3,036	3,161
Accumulated Amortization	(1,339)	(1,035)
Total	$ 1,697	2,126
Domain names | Minimum
Intangible Assets [Line Items]
Useful Life	5 years
Domain names | Maximum
Intangible Assets [Line Items]
Useful Life	10 years
Issued patents
Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,232	3,271
Accumulated Amortization	(1,567)	(1,339)
Total	$ 1,665	1,932
Issued patents | Minimum
Intangible Assets [Line Items]
Useful Life	5 years
Issued patents | Maximum
Intangible Assets [Line Items]
Useful Life	25 years
Issued trademarks
Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,002	1,166
Accumulated Amortization	(227)	(678)
Total	$ 775	488
Issued trademarks | Minimum
Intangible Assets [Line Items]
Useful Life	3 years
Issued trademarks | Maximum
Intangible Assets [Line Items]
Useful Life	15 years
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,780	3,721
Accumulated Amortization	(1,955)	(1,416)
Total	$ 1,825	2,305
Customer relationships | Minimum
Intangible Assets [Line Items]
Useful Life	4 years
Customer relationships | Maximum
Intangible Assets [Line Items]
Useful Life	8 years
Non-compete agreements
Intangible Assets [Line Items]
Gross Carrying Amount	$ 460	450
Accumulated Amortization	(429)	(404)
Total	$ 31	46
Non-compete agreements | Minimum
Intangible Assets [Line Items]
Useful Life	3 years
Non-compete agreements | Maximum
Intangible Assets [Line Items]
Useful Life	4 years
Developed technology
Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,660	10,660
Accumulated Amortization	(8,713)	(6,528)
Total	$ 1,947	4,132
Developed technology | Minimum
Intangible Assets [Line Items]
Useful Life	3 years
Developed technology | Maximum
Intangible Assets [Line Items]
Useful Life	5 years
Re-acquired distribution rights
Intangible Assets [Line Items]
Useful Life	2 years
Gross Carrying Amount	$ 2,202	2,009
Accumulated Amortization	$ (2,202)	$ (2,009)