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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

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