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OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Leases      
Operating lease ROU assets, Beginning $ 32,781    
Adjustment to ROU asset for remeasurement of Somerville Sublease liability 4,245    
Amortization of operating lease ROU assets (1,036) $ (83)  
Operating lease ROU assets, Ending 35,990    
Operating lease liabilities, Beginning 35,070    
Adjustment to lease liablity due to remeasurement of Somerville Sublease 4,245    
Accretion of interest for Somerville Sublease 1,787    
Principal payments on operating lease liabilities (792)    
Operating lease liabilities, Ending 40,310    
Less non-current portion 36,044   $ 32,854
Current portion $ 4,266   $ 2,216