Segment Data - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments of company \| segment			2
Segment Reporting Information [Line Items]
Net sales	$ 99,226	$ 79,643	$ 200,441	$ 158,885
Cost of sales	36,083	34,006	72,837	64,578
Gross margin	63,143	45,637	127,604	94,307
Sales, general and administrative	39,343	31,824	75,102	62,681
Research and development	18,501	12,989	33,620	25,452
Income from operations	5,299	824	18,882	6,174
TASER Weapons
Segment Reporting Information [Line Items]
Net sales	60,624	53,016		110,687
Software and Sensors
Segment Reporting Information [Line Items]
Net sales	38,602	26,627		48,198
Operating Segments \| TASER Weapons
Segment Reporting Information [Line Items]
Net sales	60,624	53,016	124,148	110,687
Cost of sales	17,681	16,078	38,224	34,104
Gross margin	42,943	36,938	85,924	76,583
Sales, general and administrative	21,920	17,492	43,185	34,708
Research and development	4,019	1,863	6,979	4,075
Income from operations	17,004	17,583	35,760	37,800
Operating Segments \| Software and Sensors
Segment Reporting Information [Line Items]
Net sales	38,602	26,627	76,293	48,198
Cost of sales	18,402	17,928	34,613	30,474
Gross margin	20,200	8,699	41,680	17,724
Sales, general and administrative	17,423	14,332	31,917	27,973
Research and development	14,482	11,126	26,641	21,377
Income from operations	(11,705)	(16,759)	(16,878)	(31,626)
Product
Segment Reporting Information [Line Items]
Net sales	76,721	66,875	157,695	134,366
Cost of sales	31,087	30,172	63,521	57,244
Product \| Operating Segments \| TASER Weapons
Segment Reporting Information [Line Items]
Net sales	60,624	53,016	124,148	110,687
Cost of sales	17,681	16,078	38,224	34,104
Product \| Operating Segments \| Software and Sensors
Segment Reporting Information [Line Items]
Net sales	16,097	13,859	33,547	23,679
Cost of sales	13,406	14,094	25,297	23,140
Service
Segment Reporting Information [Line Items]
Net sales	22,505	12,768	42,746	24,519
Cost of sales	4,996	3,834	9,316	7,334
Service \| Operating Segments \| TASER Weapons
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Cost of sales	0	0	0	0
Service \| Operating Segments \| Software and Sensors
Segment Reporting Information [Line Items]
Net sales	22,505	12,768	42,746	24,519
Cost of sales	$ 4,996	$ 3,834	$ 9,316	$ 7,334

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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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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