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SHAREHOLDERS' EQUITY (DEFICIT) - Stock Option - Equity Incentive Plans (Q1) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 01, 2023
Nov. 28, 2023
Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Common stock, par value (in dollars per share) $ 0.0001   $ 0.0001 $ 0.0001 $ 0.0001   $ 0.0001
Stock-based compensation $ 83 $ 8 $ 82 $ 17      
2021 Plan              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Number of options available for grant (in shares) 0       0    
Number of stock options authorized for issuance (in shares)             2,724,347
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