Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of reportable segments of company			2
Aggregated operating segments			0
Percentage of net sale represented	10.00%		10.00%
Warranty period			1 year
Minimum [Member]
Segment Reporting Information [Line Items]
Service term for services purchased			1 year
Maximum [Member]
Segment Reporting Information [Line Items]
Service term for services purchased			5 years
Other Countries [Member]
Segment Reporting Information [Line Items]
Number of customer outside the united states	0		0
TASER C2 [Member]
Segment Reporting Information [Line Items]
Standard warranty period			1 year
Previous warranty period after purchase of product			90 days
Distributor One [Member]
Segment Reporting Information [Line Items]
Maximum percentage of total sales represented by one customer	12.10%	24.10%	13.10%	18.80%
Accounts and notes receivable by customers one			13.50%		17.20%
Distributor Two [Member]
Segment Reporting Information [Line Items]
Accounts and notes receivable by customers one			11.90%
EVIDENCE.com [Member]
Segment Reporting Information [Line Items]
Deferred revenue	$ 2.4		$ 2.4		$ 1.3
Extended Product Warranty [Member]
Segment Reporting Information [Line Items]
Deferred revenue	$ 12.9		$ 12.9		$ 10.8
Extended Product Warranty [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Period of extended warranty after expiration of standard warranty			1 year
Extended Product Warranty [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Period of extended warranty after expiration of standard warranty			5 years