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GOODWILL AND INTANGIBLE ASSETS - Acquired Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 237,871 | $ 19,846
Accumulated Amortization | (30,548) | (15,551)
Net | $ 207,323 | $ 4,295
Weighted Average |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life (Years) | 4 years 7 months 6 days | 9 years
Customer lists |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 128,304 | $ 288
Accumulated Amortization | (8,406) | (288)
Net | $ 119,898 | 0
Customer lists | Weighted Average |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life (Years) | 4 years 9 months 18 days |
Patents and technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 101,001 | 11,044
Accumulated Amortization | (13,893) | (6,943)
Net | $ 87,108 | $ 4,101
Patents and technology | Weighted Average |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life (Years) | 4 years 2 months 12 days | 9 years 3 months 18 days
Trade names |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 5,140 | $ 5,114
Accumulated Amortization | (4,946) | (5,114)
Net | $ 194 | 0
Trade names | Weighted Average |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life (Years) | 1 year 3 months 18 days |
Other |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 3,426 | 3,400
Accumulated Amortization | (3,303) | (3,206)
Net | $ 123 | $ 194
Other | Weighted Average |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Weighted-Average Useful Life (Years) | 2 years 9 months 18 days | 3 years

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