Goodwill and Intangible Assets - Intangible Assets Other than Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Gross Carrying Amount	$ 15,798	$ 7,563
Accumulated Amortization	(2,525)	(1,617)
Total	13,273	5,946
Not amortized, Gross Carrying Amount	1,945	1,642
Intangible assets, Gross Carrying Amount	17,743	9,205
Intangible Assets, Net Carrying Amount	15,218	7,588
Amortization of Intangible Assets	900	800	$ 200
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	1,045	742
Domain names
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Gross Carrying Amount	3,161	125
Accumulated Amortization	(125)	(120)
Total	$ 3,036	5
Domain names | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	5 years
Domain names | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	10 years
Issued patents
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Gross Carrying Amount	$ 1,942	1,866
Accumulated Amortization	(780)	(659)
Total	$ 1,162	1,207
Issued patents | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	4 years
Issued patents | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	15 years
Issued trademarks
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Gross Carrying Amount	$ 655	603
Accumulated Amortization	(320)	(255)
Total	$ 335	348
Issued trademarks | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	3 years
Issued trademarks | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	11 years
Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Gross Carrying Amount	$ 914	1,035
Accumulated Amortization	(240)	(93)
Total	$ 674	942
Customer relationships | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	4 years
Customer relationships | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	8 years
Non-compete agreements
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Gross Carrying Amount	$ 465	464
Accumulated Amortization	(236)	(164)
Total	$ 229	300
Non-compete agreements | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	3 years
Non-compete agreements | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	4 years
Developed technology
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Gross Carrying Amount	$ 8,661	3,470
Accumulated Amortization	(824)	(326)
Total	$ 7,837	$ 3,144
Developed technology | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	5 years
Developed technology | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized, Useful Life	7 years