Goodwill and Intangible Assets - Intangible Assets Other than Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 24,438	$ 26,727
Accumulated Amortization	(13,409)	(12,650)
Total	11,029	14,077
Not amortized, Gross Carrying Amount	1,742	1,858
Intangible assets, Gross Carrying Amount	26,180	28,585
Intangible Assets, Net Carrying Amount	12,771	15,935
Amortization of intangible assets	3,500	5,700	$ 4,700
TASER trademark
Acquired Indefinite-lived Intangible Assets [Line Items]
Not amortized, Gross Carrying Amount	900	900
Patents and trademarks pending
Acquired Indefinite-lived Intangible Assets [Line Items]
Not amortized, Gross Carrying Amount	842	958
Domain names
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	3,161	3,161
Accumulated Amortization	(1,035)	(732)
Total	$ 2,126	2,429
Domain names | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	5 years
Domain names | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	10 years
Issued patents
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,271	2,940
Accumulated Amortization	(1,339)	(1,106)
Total	$ 1,932	1,834
Issued patents | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	5 years
Issued patents | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	25 years
Issued trademarks
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,166	1,053
Accumulated Amortization	(678)	(599)
Total	$ 488	454
Issued trademarks | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	3 years
Issued trademarks | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	15 years
Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,721	3,701
Accumulated Amortization	(1,416)	(880)
Total	$ 2,305	2,821
Customer relationships | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	4 years
Customer relationships | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	8 years
Non-compete agreements
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 450	540
Accumulated Amortization	(404)	(439)
Total	$ 46	101
Non-compete agreements | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	3 years
Non-compete agreements | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	4 years
Developed technology
Acquired Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,660	13,404
Accumulated Amortization	(6,528)	(7,081)
Total	$ 4,132	6,323
Developed technology | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	3 years
Developed technology | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	5 years
Re-acquired distribution rights
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	2 years
Gross Carrying Amount	$ 2,009	1,928
Accumulated Amortization	(2,009)	(1,813)
Total	$ 0	$ 115