Segment Data - Additional Information (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments of company \| segment	2
Segment Reporting Information [Line Items]
Net sales	$ 115,810	$ 101,215
Cost of sales	46,893	36,754
Gross margin	68,917	64,461
Research and development	23,354	15,119
TASER
Segment Reporting Information [Line Items]
Net sales	65,391	63,524
Cost of sales	23,278	20,543
Gross margin	42,113	42,981
Research and development	3,712	2,960
Software and Sensors
Segment Reporting Information [Line Items]
Net sales	50,419	37,691
Cost of sales	23,615	16,211
Gross margin	26,804	21,480
Research and development	19,642	12,159
Product
Segment Reporting Information [Line Items]
Net sales	88,089	80,974
Cost of sales	39,600	32,434
Product \| TASER
Segment Reporting Information [Line Items]
Net sales	65,301	63,524
Cost of sales	23,278	20,543
Product \| Software and Sensors
Segment Reporting Information [Line Items]
Net sales	22,788	17,450
Cost of sales	16,322	11,891
Service
Segment Reporting Information [Line Items]
Net sales	27,721	20,241
Cost of sales	7,293	4,320
Service \| TASER
Segment Reporting Information [Line Items]
Net sales	90	0
Cost of sales	0	0
Service \| Software and Sensors
Segment Reporting Information [Line Items]
Net sales	27,631	20,241
Cost of sales	$ 7,293	$ 4,320

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
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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