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LEASES, Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Operating Lease, ROU Assets [Abstract]      
Operating lease ROU assets, Beginning $ 1,030    
Recognition of ROU asset for Somerville Sublease 34,410    
Amortization of operating lease ROU assets (580) $ (267)  
Operating lease ROU assets, Ending 34,860    
Operating Lease, Liabilities [Abstract]      
Operating lease liabilities, Beginning 1,182    
Recognition of lease liability for Somerville Sublease 34,169    
Accretion of interest for Somerville Sublease 1,055    
Principal payments on operating lease liabilities (259)    
Operating lease liabilities, Ending 36,147    
Less non-current portion 34,998   $ 887
Current portion $ 1,149