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INCOME TAXES - Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
IPR&D | $ (3,969) | $ (12,528)
Property and equipment | 0 | 0
Total Deferred Tax Liabilities | $ (3,969) | $ (12,528)

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