Deferred Revenue - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Total current portion of deferred revenue	$ 10,033	$ 6,878
EVIDENCE.com [Member]
Deferred Revenue Arrangement [Line Items]
Total current portion of deferred revenue	3,300
Warranty [Member]
Deferred Revenue Arrangement [Line Items]
Total current portion of deferred revenue	6,300
TASER Assurance Program [Member]
Deferred Revenue Arrangement [Line Items]
Total current portion of deferred revenue	$ 300