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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 171,851	$ 130,837	$ 112,362	$ 115,810	$ 114,791	$ 104,836	$ 99,226	$ 101,215	$ 530,860	$ 420,068	$ 343,798
Cost of sales									223,574	161,485	136,710
Gross margin	$ 92,640	$ 80,169	$ 65,560	$ 68,917	$ 65,346	$ 65,633	$ 63,143	$ 64,461	307,286	258,583	207,088
Research and development									100,721	76,856	55,373
TASER
Segment Reporting Information [Line Items]
Net sales									281,661	253,115	234,512
Cost of sales									107,188	80,354	72,054
Gross margin									174,473	172,761	162,458
Research and development									14,469	17,012	8,377
Software and Sensors
Segment Reporting Information [Line Items]
Net sales									249,199	166,953	109,286
Cost of sales									116,386	81,131	64,656
Gross margin									132,813	85,822	44,630
Research and development									86,252	59,844	46,996
Product
Segment Reporting Information [Line Items]
Net sales									399,474	327,635	285,859
Cost of sales									190,683	139,337	117,997
Product | TASER
Segment Reporting Information [Line Items]
Net sales									280,554	253,115	234,512
Cost of sales									107,188	80,354	72,054
Product | Software and Sensors
Segment Reporting Information [Line Items]
Net sales									118,920	74,520	51,347
Cost of sales									83,495	58,983	45,943
Service
Segment Reporting Information [Line Items]
Net sales									131,386	92,433	57,939
Cost of sales									32,891	22,148	18,713
Service | TASER
Segment Reporting Information [Line Items]
Net sales									1,107	0	0
Cost of sales									0	0	0
Service | Software and Sensors
Segment Reporting Information [Line Items]
Net sales									130,279	92,433	57,939
Cost of sales									$ 32,891	$ 22,148	$ 18,713