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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Product sales	$ 82,077	$ 71,882	$ 58,756	$ 55,530	$ 56,041	$ 50,376	$ 46,713	$ 44,762	$ 238,573	$ 185,230	$ 160,313
Service revenue									29,672	12,662	4,212
Net sales									268,245	197,892	164,525
Cost of products sold									91,536	65,022	60,913
Cost of services delivered									6,173	4,223	2,064
Gross margin	$ 49,770	$ 46,565	$ 37,299	$ 36,902	$ 36,988	$ 31,068	$ 30,723	$ 29,868	170,536	128,647	101,548
Sales, general and administrative									108,076	69,698	54,158
Research and development									30,609	23,614	14,885
Income from operations									31,851	35,335	32,505
Purchase of property and equipment									4,957	6,003	2,505
Purchase of intangible assets									3,495	501	183
Purchase of intangible assets in connection with business acquisitions									6,825
Purchase of property and equipment and intangible assets in connection with business acquisitions										12,599
Depreciation and amortization									3,658	3,291	4,317
TASER Weapons
Segment Reporting Information [Line Items]
Product sales									202,644	162,375	145,613
Service revenue									0	0	0
Net sales									202,644	162,375	145,613
Cost of products sold									61,930	48,821	47,680
Cost of services delivered									0	0	0
Gross margin									140,714	113,554	97,933
Sales, general and administrative									63,617	47,640	42,989
Research and development									5,887	4,470	3,872
Income from operations									71,210	61,444	51,072
Purchase of property and equipment									4,129	4,159	2,233
Purchase of intangible assets									262	277	180
Purchase of intangible assets in connection with business acquisitions									0
Purchase of property and equipment and intangible assets in connection with business acquisitions										1,453
Depreciation and amortization									2,207	2,311	3,936
Axon
Segment Reporting Information [Line Items]
Product sales									35,929	22,855	14,700
Service revenue									29,672	12,662	4,212
Net sales									65,601	35,517	18,912
Cost of products sold									29,606	16,201	13,233
Cost of services delivered									6,173	4,223	2,064
Gross margin									29,822	15,093	3,615
Sales, general and administrative									44,459	22,058	11,169
Research and development									24,722	19,144	11,013
Income from operations									(39,359)	(26,109)	(18,567)
Purchase of property and equipment									828	1,844	272
Purchase of intangible assets									3,233	224	3
Purchase of intangible assets in connection with business acquisitions									6,825
Purchase of property and equipment and intangible assets in connection with business acquisitions										11,146
Depreciation and amortization									$ 1,451	$ 980	$ 381