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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (FY) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]        
Bad debt expense $ 0 $ 0 $ 106 $ 5