Segment Data - Summary of Operational Information Relative to the Company's Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Product sales	$ 56,041	$ 50,376	$ 46,713	$ 44,762	$ 46,816	$ 44,349	$ 37,175	$ 36,185	$ 185,230	$ 160,313	$ 136,123
Service revenue									12,662	4,212	1,708
Net sales									197,892	164,525	137,831
Cost of products sold									65,022	60,913	50,099
Cost of services delivered									4,223	2,064	1,889
Gross margin	36,988	$ 31,068	$ 30,723	$ 29,868	27,413	$ 28,713	$ 23,214	$ 22,208	128,647	101,548	85,843
Sales, general and administrative									69,698	54,158	46,557
Research and development									23,614	14,885	9,888
Litigation settlement (judgement)									0	0	1,450
Income from operations									35,335	32,505	27,948
Purchase of property and equipment									6,003	2,505	1,783
Purchase of intangible assets									501	183	323
Purchase of property and equipment and intangible assets in connection with business acquisitions (a)									13,119
Depreciation and amortization									3,291	4,317	5,131
Goodwill	9,596				$ 2,206				9,596	2,206
Various business acquisitions
Segment Reporting Information [Line Items]
Goodwill	7,500								7,500
TASER Weapons
Segment Reporting Information [Line Items]
Product sales									162,375	145,613	127,474
Service revenue									0
Net sales									162,375	145,613	127,474
Cost of products sold									48,821	47,680	44,025
Cost of services delivered									0
Gross margin									113,554	97,933	83,449
Sales, general and administrative									47,640	42,989	40,174
Research and development									4,470	3,872	4,311
Litigation settlement (judgement)										0	1,450
Income from operations									61,444	51,072	37,514
Purchase of property and equipment									4,159	2,233	1,324
Purchase of intangible assets									277	180	307
Purchase of property and equipment and intangible assets in connection with business acquisitions (a)									1,536
Depreciation and amortization									2,311	3,936	4,011
Goodwill	800								800
Axon
Segment Reporting Information [Line Items]
Product sales									22,855	14,700	8,649
Service revenue									12,662	4,212	1,708
Net sales									35,517	18,912	10,357
Cost of products sold									16,201	13,233	6,074
Cost of services delivered									4,223	2,064	1,889
Gross margin									15,093	3,615	2,394
Sales, general and administrative									22,058	11,169	6,383
Research and development									19,144	11,013	5,577
Income from operations									(26,109)	(18,567)	(9,566)
Purchase of property and equipment									1,844	272	459
Purchase of intangible assets									224	3	16
Purchase of property and equipment and intangible assets in connection with business acquisitions (a)									11,583
Depreciation and amortization									980	$ 381	$ 1,120
Goodwill	$ 6,700								$ 6,700