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SHAREHOLDERS' EQUITY (DEFICIT) - Conversion of Preferred Stock, Founder, and Public Shares (FY) (Details)
$ / shares in Units, $ in Thousands
 11 Months Ended 12 Months Ended
Dec. 01, 2023
USD ($)
$ / shares
shares
Nov. 30, 2023
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Mar. 31, 2024
shares
Dec. 31, 2022
USD ($)
shares
Conversion of Stock [Line Items]            
Collection on subscription receivable | $     $ 15      
Preferred Stock outstanding (in shares)     0      
Exchange ratio 1.01508          
Preferred stock, shares issued (in shares)     0   0 0
PACI Public Shareholders | Proof Acquisition Corp I            
Conversion of Stock [Line Items]            
Stock issued during period (in shares) 1,767,390          
PACI Sponsors | Proof Acquisition Corp I            
Conversion of Stock [Line Items]            
Stock issued during period (in shares) 6,883,579          
2022 Convertible Notes | Convertible Debt            
Conversion of Stock [Line Items]            
Debt instrument, face amount | $   $ 19,100       $ 18,900
Accrued interest | $   800        
Conversion price (in dollars per share) | $ / shares $ 5.982          
2023 Convertible Notes | Convertible Debt            
Conversion of Stock [Line Items]            
Debt instrument, face amount | $ $ 18,420 18,400 $ 18,420      
Accrued interest | $ $ 34 $ 100        
Conversion price (in dollars per share) | $ / shares $ 9          
Series Seed Preferred Stock            
Conversion of Stock [Line Items]            
Stock issued during period (in shares)       3,981,236    
Stock issued during the period, value | $       $ 4,585    
Preferred Stock outstanding (in shares) 3,981,236          
Convertible preferred stock, shares issued upon conversion (in shares) 4,041,282          
Series A-1 Preferred Stock            
Conversion of Stock [Line Items]            
Stock issued during period (in shares)     2,411,087      
Stock issued during the period, value | $     $ 24,200      
Preferred Stock outstanding (in shares) 2,411,087          
Convertible preferred stock, shares issued upon conversion (in shares) 2,447,453          
Series A-2 Preferred Stock            
Conversion of Stock [Line Items]            
Preferred Stock outstanding (in shares) 3,327,624          
Convertible preferred stock, shares issued upon conversion (in shares) 3,377,812          
Preferred stock, shares issued (in shares) 3,327,624          
Series A-2 Preferred Stock | 2022 Convertible Notes | Convertible Debt            
Conversion of Stock [Line Items]            
Shares issued in relation to convertible notes (in shares)   3,327,624        
Series A-3 Preferred Stock            
Conversion of Stock [Line Items]            
Preferred Stock outstanding (in shares) 2,050,628          
Convertible preferred stock, shares issued upon conversion (in shares) 2,081,556          
Series A-3 Preferred Stock | 2023 Convertible Notes | Convertible Debt            
Conversion of Stock [Line Items]            
Stock issued during period (in shares)   2,050,628        
Shares issued in relation to convertible notes (in shares)   2,050,628