Goodwill and Intangible Assets - Definite-Lived Intangible Assets Other than Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 24,443	$ 24,438
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(15,758)	(13,409)
Total	8,685	11,029
Non-amortizable (indefinite-lived) intangible assets, Carrying Amount	1,575	1,742
Intangible assets, Gross Carrying Amount	26,018	26,180
Intangible assets, Net Carrying Amount	10,260	12,771
TASER trademark
Intangible Assets [Line Items]
Non-amortizable (indefinite-lived) intangible assets, Carrying Amount	900	900
Patents and trademarks pending
Intangible Assets [Line Items]
Non-amortizable (indefinite-lived) intangible assets, Carrying Amount	675	842
Domain names
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	3,161	3,161
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(1,263)	(1,035)
Total	$ 1,898	2,126
Domain names | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	5 years
Domain names | Maximum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	10 years
Issued patents
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 3,216	3,271
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(1,510)	(1,339)
Total	$ 1,706	1,932
Issued patents | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	5 years
Issued patents | Maximum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	25 years
Issued trademarks
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 1,200	1,166
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(573)	(678)
Total	$ 627	488
Issued trademarks | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	3 years
Issued trademarks | Maximum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	15 years
Customer relationships
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 3,712	3,721
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(1,784)	(1,416)
Total	$ 1,928	2,305
Customer relationships | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	4 years
Customer relationships | Maximum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	8 years
Non-compete agreements
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 452	450
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(419)	(404)
Total	$ 33	46
Non-compete agreements | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	3 years
Non-compete agreements | Maximum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	4 years
Developed technology
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 10,660	10,660
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(8,167)	(6,528)
Total	$ 2,493	4,132
Developed technology | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	3 years
Developed technology | Maximum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	5 years
Re-acquired distribution rights
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	2 years
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 2,042	2,009
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(2,042)	$ (2,009)
Total	$ 0