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Related Party Transactions (FY) (Details) - USD ($)
3 Months Ended 7 Months Ended 10 Months Ended 12 Months Ended
Mar. 16, 2023
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Jun. 16, 2021
Related Party Transaction [Line Items]                
Accounts receivable, net   $ 7,893,000 $ 11,158,000 $ 17,438,000   $ 11,158,000 $ 17,438,000  
Related Party                
Related Party Transaction [Line Items]                
Interest rate         5.00%      
Interest rate if defaulted   10.00%            
Accounts receivable, net   $ 600,000 700,000     700,000    
Investment income, interest   100,000       100,000    
Related Party | Prepaid Expenses and Other Current Assets                
Related Party Transaction [Line Items]                
Accounts receivable, net   300,000 400,000     400,000    
Related Party | Other Assets                
Related Party Transaction [Line Items]                
Accounts receivable, net $ 1,100,000 300,000 300,000 1,100,000   300,000 1,100,000  
Silver Spike Sponsor                
Related Party Transaction [Line Items]                
Term 12 months              
Interest rate 5.00%              
Interest rate if defaulted 10.00%              
Silver Spike Sponsor | Silver Spike                
Related Party Transaction [Line Items]                
Transaction expenses   1,100,000           $ 1,100,000
Silver Spike Holdings                
Related Party Transaction [Line Items]                
Legal fees     400,000          
Sublease Agreement                
Related Party Transaction [Line Items]                
Income on the sublease       69,000 $ 69,000      
Sublease income, net   $ 200,000       700,000 400,000  
Sublease Agreement | Related Party | Prepaid Expenses and Other Current Assets                
Related Party Transaction [Line Items]                
Rents receivable     $ 700,000     $ 700,000    
Sublease Agreement | Related Party | Accounts Receivable                
Related Party Transaction [Line Items]                
Rents receivable       $ 100,000     $ 100,000