Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Acquisitions and Disposals [Line Items]
Write/down and disposal of property and equipment, net	$ 27,000	$ 200,000	$ 2,800,000
Impairment charge			1,354,000
Depreciation and amortization expense relative to property and equipment	4,800,000	6,300,000	7,500,000
Cost of products sold and services provided	3,700,000	4,700,000	5,200,000
Proctor Product Line [Member]
Significant Acquisitions and Disposals [Line Items]
Impairment charge			1,400,000
Proctor Product Line Property and Equipment [Member]
Significant Acquisitions and Disposals [Line Items]
Impairment charge			700,000
Axon Equipment [Member]
Significant Acquisitions and Disposals [Line Items]
Write/down and disposal of property and equipment, net			1,400,000
Surplus Equipment and Billing Software [Member]
Significant Acquisitions and Disposals [Line Items]
Write/down and disposal of property and equipment, net			800,000
Taser X Three Equipment [Member]
Significant Acquisitions and Disposals [Line Items]
Write/down and disposal of property and equipment, net			$ 600,000