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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising Costs (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]        
Advertising costs $ 2,200 $ 223 $ 2,850 $ 405