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BUSINESS COMBINATIONS AND ASSET ACQUISITIONS - Schedule of Assets Acquired and Liabilities Assumed, Thrive (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jan. 05, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 2,242,535 |  | $ 1,237,672 | $ 1,203,197
Fair Value, Adjustment Disclosure [Abstract] |  |  |  |
Cash and cash equivalents | 0 |  |  |
Prepaid expenses and other current assets | 0 |  |  |
Property, plant and equipment | 0 |  |  |
Operating lease right-of-use assets | 0 |  |  |
Other long-term assets | 0 |  |  |
In-process research and development (IPR&D) | 0 |  |  |
Total identifiable assets acquired | 0 |  |  |
Accounts payable | 0 |  |  |
Accrued liabilities | (1,862) |  |  |
Operating lease liabilities, current portion | 0 |  |  |
Operating lease liabilities, less current portion | 0 |  |  |
Deferred tax liability | 0 |  |  |
Total liabilities assumed | (1,862) |  |  |
Net identifiable assets acquired | (1,862) |  |  |
Goodwill | 1,862 |  |  |
Net assets acquired | 0 |  |  |
Thrive |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents | 241,748 | $ 241,748 |  |
Prepaid expenses and other current assets | 3,939 | 3,939 |  |
Property, plant and equipment | 29,977 | 29,977 |  |
Operating lease right-of-use assets | 39,027 | 39,027 |  |
Other long-term assets | 67 | 67 |  |
In-process research and development (IPR&D) | 1,250,000 | 1,250,000 |  |
Total identifiable assets acquired | 1,564,758 | 1,564,758 |  |
Accounts payable | (3,222) | (3,222) |  |
Accrued liabilities | (8,080) | (6,218) |  |
Operating lease liabilities, current portion | (2,980) | (2,980) |  |
Operating lease liabilities, less current portion | (38,622) | (38,622) |  |
Deferred tax liability | (272,905) | (272,905) |  |
Total liabilities assumed | (325,809) | (323,947) |  |
Net identifiable assets acquired | 1,238,949 | 1,240,811 |  |
Goodwill | 948,105 | 946,243 |  |
Net assets acquired | $ 2,187,054 | $ 2,187,054 |  |

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