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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Significant Unobservable Inputs (Q1) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Forward purchase agreement | $ 2,755 | $ 2,982 | $ 0
Total | 2,755 | 2,982 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Forward purchase agreement | 0 | 0 |
Total | 0 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Forward purchase agreement | 0 | 0 |
Total | 0 | 0 |
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Forward purchase agreement | 2,755 | 2,982 |
Total | $ 2,755 | $ 2,982 |

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