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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 |

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