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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
ACCRUED EXPENSES    
External research and development $ 26,910 $ 25,494
Accrued compensation 4,740 1,251
Accrued professional services 1,270 975
Accrued consulting 487 967
Restructuring 2,798  
Other 580 909
Total accrued expenses 36,785 $ 29,596
Employee related termination costs 3,588  
Severance costs 3,700  
Other personnel costs $ 100