STOCKHOLDERS' EQUITY (Q1) (Details) - $ / shares |
Mar. 31, 2024 |
Mar. 25, 2024 |
Jan. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Jan. 31, 2022 |
Oct. 31, 2021 |
Feb. 08, 2021 |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Stockholders' Equity [Abstract] | |||||||||||
| Common shares, shares authorized (in shares) | 999,000,000 | 1,000,000,000 | 999,000,000 | 120,000,000 | 120,000,000 | 110,000,000 | 11,000 | ||||
| Common shares, par value (in dollars per share) | $ 0.0001 | $ 0.000001 | $ 0.0001 | $ 0.000001 | $ 0.000001 | $ 0.000001 | $ 0.000001 | ||||
| Common shares, shares issued (in shares) | 136,700,583 | 100,000,000 | 87,500,000 | 100,000,000 | 100,000,000 | 100,000,000 | 10,000 | ||||
| Common shares, shares outstanding (in shares) | 136,700,583 | [1] | 100,000,000 | 87,500,000 | 100,000,000 | 100,000,000 | 100,000,000 | 10,000 | |||
| Common stock, shares reclassified (in shares) | 10,000 | ||||||||||
| Capital stock authorized (in shares) | 1,000,000,000 | 11,000 | |||||||||
| Capital shares, par value (in dollars per share) | $ 0.0001 | ||||||||||
| Common Stock [Member] | |||||||||||
| Stockholders' Equity [Abstract] | |||||||||||
| Capital stock authorized (in shares) | 999,000,000 | ||||||||||
| Preferred Stock [Member] | |||||||||||
| Stockholders' Equity [Abstract] | |||||||||||
| Capital stock authorized (in shares) | 1,000,000 | ||||||||||
| Equity Incentive Plan [Member] | |||||||||||
| Stockholders' Equity [Abstract] | |||||||||||
| Common shares, shares authorized (in shares) | 100,000,000 | 7,500,000 | 7,500,000 | 1,000 | |||||||
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