Segment Data - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments of company | segment			2
Segment Reporting Information [Line Items]
Net sales	$ 112,362	$ 99,226	$ 228,172	$ 200,441
Cost of sales	46,802	36,083	93,695	72,837
Gross margin	65,560	63,143	134,477	127,604
Research and development	23,493	18,501	46,847	33,620
TASER
Segment Reporting Information [Line Items]
Net sales	60,572	60,624	125,963	124,148
Cost of sales	24,262	17,681	47,540	38,224
Gross margin	36,310	42,943	78,423	85,924
Research and development	3,087	4,019	6,799	6,979
Software and Sensors
Segment Reporting Information [Line Items]
Net sales	51,790	38,602	102,209	76,293
Cost of sales	22,540	18,402	46,155	34,613
Gross margin	29,250	20,200	56,054	41,680
Research and development	20,406	14,482	40,048	26,641
Product
Segment Reporting Information [Line Items]
Net sales	80,391	76,721	168,480	157,695
Cost of sales	38,220	31,087	77,820	63,521
Product | TASER
Segment Reporting Information [Line Items]
Net sales	60,423	60,624	125,724	124,148
Cost of sales	24,262	17,681	47,540	38,224
Product | Software and Sensors
Segment Reporting Information [Line Items]
Net sales	19,968	16,097	42,756	33,547
Cost of sales	13,958	13,406	30,280	25,297
Service
Segment Reporting Information [Line Items]
Net sales	31,971	22,505	59,692	42,746
Cost of sales	8,582	4,996	15,875	9,316
Service | TASER
Segment Reporting Information [Line Items]
Net sales	149	0	239	0
Cost of sales	0	0	0	0
Service | Software and Sensors
Segment Reporting Information [Line Items]
Net sales	31,822	22,505	59,453	42,746
Cost of sales	$ 8,582	$ 4,996	15,875	$ 9,316
Service, Installation Costs | Software and Sensors
Segment Reporting Information [Line Items]
Cost of sales			$ 900