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Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 248,242 | $ 158,236
Gross Carrying Value | 248,942 | 158,936
Accumulated Amortization | (32,653) | (23,498)
Accumulated Amortization | (32,653) | (23,498)
Net Carrying Value | 215,589 | 134,738
Net Carrying Value | $ 216,289 | $ 135,438
Weighted Average Useful Life (in years) | 16 years | 16 years
Trademark |  |
Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 700 | $ 700
Net Carrying Value | 700 | 700
Technology—developed |  |
Intangible Assets [Line Items] |  |
Gross Carrying Value | 82,088 | 53,315
Accumulated Amortization | (8,533) | (5,942)
Net Carrying Value | $ 73,555 | $ 47,373
Weighted Average Useful Life (in years) | 19 years | 19 years
Patents |  |
Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 240 | $ 240
Accumulated Amortization | $ (240) | $ (240)
Weighted Average Useful Life (in years) | 8 years | 8 years
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 160,467 | $ 101,460
Accumulated Amortization | (22,769) | (16,609)
Net Carrying Value | $ 137,698 | $ 84,851
Weighted Average Useful Life (in years) | 15 years | 14 years
Trademark |  |
Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 3,751 | $ 2,160
Accumulated Amortization | (286) | (159)
Net Carrying Value | $ 3,465 | $ 2,001
Weighted Average Useful Life (in years) | 20 years | 20 years
Other intangibles |  |
Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 1,696 | $ 1,061
Accumulated Amortization | (825) | (548)
Net Carrying Value | $ 871 | $ 513
Weighted Average Useful Life (in years) | 3 years | 3 years

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