Goodwill and Intangible Assets - Definite-Lived Intangible Assets Other than Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 24,213	$ 24,438
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(14,824)	(13,409)
Total	9,389	11,029
Non-amortizable (indefinite-lived) intangible assets, Carrying Amount	1,757	1,742
Intangible assets, Gross Carrying Amount	25,970	26,180
Intangible assets, Net Carrying Amount	11,146	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	857	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	(1,187)	(1,035)
Total	$ 1,974	2,126
Domain names | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	5 years
Issued patents
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 3,142	3,271
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(1,453)	(1,339)
Total	$ 1,689	1,932
Issued patents | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	5 years
Issued trademarks
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 1,164	1,166
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(551)	(678)
Total	$ 613	488
Issued trademarks | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	3 years
Customer relationships
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 3,672	3,721
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(1,635)	(1,416)
Total	$ 2,037	2,305
Customer relationships | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	4 years
Non-compete agreements
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Gross Carrying Amount	$ 448	450
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(411)	(404)
Total	$ 37	46
Non-compete agreements | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	3 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	(7,621)	(6,528)
Total	$ 3,039	4,132
Developed technology | Minimum
Intangible Assets [Line Items]
Amortizable (definite-lived) intangible assets, Useful Life	3 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	$ 1,966	2,009
Amortizable (definite-lived) intangible assets, Accumulated Amortization	(1,966)	$ (2,009)
Total	$ 0