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INITIAL PUBLIC OFFERING AND PRIVATE PLACEMENT (FY) (Details) - $ / shares
1 Months Ended 12 Months Ended
Dec. 01, 2023
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2024
Mar. 31, 2023
Subsidiary, Sale of Stock [Line Items]              
Number of warrants issued in the period (in shares)     0 0      
Weighted average strike price of warrants (in dollars per share)   $ 11.5 $ 11.5 $ 11.5 $ 11.5 $ 11.5 $ 11.5
PACI Public Shareholders | Proof Acquisition Corp I              
Subsidiary, Sale of Stock [Line Items]              
Stock issued during period (in shares) 1,767,390            
PACI Sponsors | Proof Acquisition Corp I              
Subsidiary, Sale of Stock [Line Items]              
Stock issued during period (in shares) 6,883,579            
Units              
Subsidiary, Sale of Stock [Line Items]              
Number of warrants issued in the period (in shares)   27,600,000     27,600,000    
Price per warrant (USD per share)   $ 10     $ 10    
Public Warrant              
Subsidiary, Sale of Stock [Line Items]              
Class of warrant or right, number of securities called by each warrant or right (in shares)   1     1    
Weighted average strike price of warrants (in dollars per share)   $ 11.5     $ 11.5    
Private Placement Warrant              
Subsidiary, Sale of Stock [Line Items]              
Number of warrants issued in the period (in shares)   15,226,000          
Price per warrant (USD per share)   $ 1     $ 1    
Class of warrant or right, number of securities called by each warrant or right (in shares)   1     1    
Weighted average strike price of warrants (in dollars per share)   $ 11.5     $ 11.5    
Common Class A              
Subsidiary, Sale of Stock [Line Items]              
Class of warrant or right, number of securities called by each warrant or right (in shares)   1     1