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REVOLVING LOAN AND PROMISSORY NOTE - RELATED PARTY - Schedule of Long-Term Debt (FY) (Details) - Affiliated Entity - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 15, 2023
Dec. 31, 2022
Dec. 09, 2021
Debt Instrument [Line Items]          
Credit facility and other loans $ 1,000 $ 1,000   $ 5,150  
March 2023 Promissory Note | Promissory Note          
Debt Instrument [Line Items]          
Credit facility and other loans $ 1,000 $ 1,000   0  
Interest rate 10.00% 10.00% 10.00%    
Revolving Credit Facility | December 2021 Convertible Note          
Debt Instrument [Line Items]          
Credit facility and other loans   $ 0   $ 5,150  
Revolving Credit Facility | December 2021 Note          
Debt Instrument [Line Items]          
Interest rate   9.00%   4.00% 4.00%