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Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 157,413 | $ 158,084
Accumulated Amortization | $ (20,879) | $ (13,331)
Weighted Average Useful Life (in years) | 16 years | 16 years
Trademark |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount, indefinite lived intangible assets | $ 700 | $ 700
Technology - developed |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 51,689 | 51,801
Accumulated Amortization | $ (5,221) | $ (3,201)
Weighted Average Useful Life (in years) | 19 years | 19 years
Patents |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 240 | $ 240
Accumulated Amortization | $ (240) | $ (238)
Weighted Average Useful Life (in years) | 8 years | 8 years
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 101,563 | $ 102,120
Accumulated Amortization | $ (14,821) | $ (9,636)
Weighted Average Useful Life (in years) | 14 years | 14 years
Other intangibles |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 1,061 | $ 1,063
Accumulated Amortization | $ (466) | $ (209)
Weighted Average Useful Life (in years) | 3 years | 3 years
Trademark |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 2,160 | $ 2,160
Accumulated Amortization | $ (131) | $ (47)
Weighted Average Useful Life (in years) | 20 years | 20 years

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