Goodwill and Intangible Assets - Intangible Assets Other than Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 3,933	$ 4,007
Amortized intangible assets, Gross Carrying Amount	2,418	2,091
Accumulated Amortization	(826)	(690)
Intangible assets, Net Carrying Amount	3,107	3,317
Amortized intangible assets, Net Carrying Amount	1,592	1,401
Not amortized intangible assets, Carrying Amount	1,515	1,916
Domain Names [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	125	125
Accumulated Amortization	(111)	(102)
Amortized intangible assets, Net Carrying Amount	14	23
Amortized intangible assets, Useful Life	5 years
Issued Patents [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	1,735	1,529
Accumulated Amortization	(524)	(441)
Amortized intangible assets, Net Carrying Amount	1,211	1,088
Issued Patents [Member] | Minimum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, Useful Life	4 years
Issued Patents [Member] | Maximum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, Useful Life	15 years
Issued Trademarks [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	558	437
Accumulated Amortization	(191)	(147)
Amortized intangible assets, Net Carrying Amount	367	290
Issued Trademarks [Member] | Minimum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, Useful Life	9 years
Issued Trademarks [Member] | Maximum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortized intangible assets, Useful Life	11 years
TASER Trademark [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Not amortized intangible assets, Carrying Amount	900	900
Patents and Trademarks Pending [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Not amortized intangible assets, Carrying Amount	$ 615	$ 1,016