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SHAREHOLDERS' EQUITY (DEFICIT) - Stock Option - Equity Incentive Plans (FY) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2024
$ / shares
shares
Dec. 01, 2023
$ / shares
shares
Nov. 28, 2023
shares
Mar. 31, 2023
shares
Dec. 31, 2022
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Common stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001 $ 0.0001     $ 0.0001 $ 0.0001
Exchange ratio     1.01508        
Options outstanding (in shares) 2,369,169 2,289,159     2,478,020 2,507,618 613,463
Weighted average grant date fair value of stock options (USD per share) | $ / shares $ 3.81            
Unrecognized compensation costs related to non-vested awards | $ $ 1.4            
2021 Plan              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Number of stock options authorized for issuance (in shares)             2,724,347
Options outstanding (in shares)     2,369,169        
Number of options available for grant (in shares)   0 0        
2023 Plan              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Number of stock options authorized for issuance (in shares)       5,608,690