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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Forward Purchase Agreement Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance December 31, 2023 $ 2,982    
Change in fair value (227) $ 0 $ (13,400)
Balance March 31, 2024 $ 2,755   $ 2,982