Goodwill and Intangible Assets - Intangible Assets Other than Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 2,450	$ 2,091
Accumulated amortization	(868)	(690)
Total	1,582	1,401
Not amortized intangible assets, carrying amount	1,533	1,916
Intangible assets, gross carrying amount	3,983	4,007
Intangible assets, net carrying amount	3,115	3,317
TASER trademark
Acquired Indefinite-lived Intangible Assets [Line Items]
Not amortized intangible assets, carrying amount	900	900
Patents and trademarks pending
Acquired Indefinite-lived Intangible Assets [Line Items]
Not amortized intangible assets, carrying amount	633	1,016
Domain names
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, useful life	5 years
Amortized intangible assets, gross carrying amount	125	125
Accumulated amortization	(114)	(102)
Total	11	23
Issued patents
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	1,759	1,529
Accumulated amortization	(549)	(441)
Total	1,210	1,088
Issued patents | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, useful life	4 years
Issued patents | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, useful life	15 years
Issued trademarks
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	566	437
Accumulated amortization	(205)	(147)
Total	$ 361	$ 290
Issued trademarks | Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, useful life	9 years
Issued trademarks | Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, useful life	11 years