Deferred Revenue - Summary of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 24,139	$ 20,219
Total current portion of deferred revenue	8,231	6,878
Total long-term portion of deferred revenue	15,908	13,341
Warranty [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	17,675	15,889
Total current portion of deferred revenue	5,600
EVIDENCE.com [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	4,777	4,026
TASER Assurance Plan [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	1,333	138
Other [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue	$ 354	$ 166