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ACCRUED EXPENSES - Components of Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
Research and development $ 1,847 $ 1,841
Payroll-related expenses 3,099 2,967
Restructuring charge related 394 1,497
Professional fees 507 597
Legal expenses, including preliminary litigation settlement 22,477 1,344
Other 1,527 9
Total Accrued Expenses $ 29,851 $ 8,255