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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, gross | $ 969,308,000 |  | $ 969,308,000 |  |
Finite-lived intangible assets, accumulated amortization | 174,350,000 |  | 174,350,000 |  | $ 110,889,000
Impairment losses | 0 | $ 0 | 0 | $ 0 |
In-process research and development |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets, finite-lived | $ 20,200,000 | 200,000,000 | $ 20,200,000 | 200,000,000 |
In-process research and development | Armune Biosciences Agreement |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of intangible assets, finite-lived |  | 9,700,000 |  | 9,700,000 |
Finite-lived intangible assets, gross |  | 12,200,000 |  | 12,200,000 |
Finite-lived intangible assets, accumulated amortization |  | $ 2,500,000 |  | $ 2,500,000 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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