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ACCRUED EXPENSES - Schedule Of Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
Compensation $ 12,997 $ 27,686
PPG agreements 6,705 8,853
Research and development agreements 1,746 1,469
Professional fees 1,432 1,000
Consulting 645 1,314
Royalties 154 691
Other 3,281 4,461
Accrued expenses $ 26,960 $ 45,474