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MERGER TRANSACTION COSTS PAYABLE - Summary (Q1) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Other Liabilities Disclosure [Abstract] |  |  |
Merger transaction costs payable in shares | $ 0 | $ 4,250 | $ 0

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- Definition The amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable within one year of the reporting date or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481648/480-10-50-2 + Details
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