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LEASES, Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 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 (83) $ (186)  
Operating lease ROU assets, Ending 35,357    
Operating Lease, Liabilities [Abstract]      
Operating lease liabilities, Beginning 1,182    
Recognition of lease liability for Somerville Sublease 34,169    
Principal payments on operating lease liabilities (215)    
Operating lease liabilities, Ending 35,136    
Less non-current portion 34,963   $ 887
Current portion $ 173