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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
ACCRUED EXPENSES    
External research and development $ 1,203 $ 25,494
Accrued compensation 6,025 1,251
Accrued professional services 3,055 975
Accrued consulting 131 967
Restructuring 44,113  
Other 1,096 909
Total accrued expenses $ 55,623 $ 29,596