Segment Data - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments of company \| segment			2
Segment Reporting Information [Line Items]
Net sales	$ 130,837	$ 104,836	$ 359,009	$ 305,277
Cost of sales	50,668	39,203	144,363	112,040
Gross margin	80,169	65,633	214,646	193,237
Research and development	25,129	21,982	71,976	55,602
TASER
Segment Reporting Information [Line Items]
Net sales	71,743	63,666	197,706	187,814
Cost of sales	26,504	19,256	74,044	57,480
Gross margin	45,239	44,410	123,662	130,334
Research and development	3,485	4,837	10,284	11,816
Software and Sensors
Segment Reporting Information [Line Items]
Net sales	59,094	41,170	161,303	117,463
Cost of sales	24,164	19,947	70,319	54,560
Gross margin	34,930	21,223	90,984	62,903
Research and development	21,644	17,145	61,692	43,786
Product
Segment Reporting Information [Line Items]
Net sales	96,497	80,923	264,977	238,618
Cost of sales	42,445	32,953	120,265	96,474
Product \| TASER
Segment Reporting Information [Line Items]
Net sales	71,424	63,666	197,148	187,814
Cost of sales	26,504	19,256	74,044	57,480
Product \| Software and Sensors
Segment Reporting Information [Line Items]
Net sales	25,073	17,257	67,829	50,804
Cost of sales	15,941	13,697	46,221	38,994
Service
Segment Reporting Information [Line Items]
Net sales	34,340	23,913	94,032	66,659
Cost of sales	8,223	6,250	24,098	15,566
Service \| TASER
Segment Reporting Information [Line Items]
Net sales	319	0	558	0
Cost of sales	0	0	0	0
Service \| Software and Sensors
Segment Reporting Information [Line Items]
Net sales	34,021	23,913	93,474	66,659
Cost of sales	8,223	$ 6,250	24,098	$ 15,566
Service, Installation Costs \| Software and Sensors
Segment Reporting Information [Line Items]
Cost of sales	$ 700		$ 1,600

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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-Name Accounting Standards Codification
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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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