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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Loss Per Share (Q1) (Details) - $ / shares | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Accounting Policies [Abstract] |  |  |  |  |
Options outstanding (in shares) | 2,289,159 | 2,369,169 | 2,478,020 | 2,507,618 | 613,463
Warrants outstanding (in shares) | 29,026,000 | 29,026,000 | 29,026,000 | 29,026,000 | 29,026,000
Weighted average strike price of warrants (in dollars per share) | $ 11.5 | $ 11.5 | $ 11.5 | $ 11.5 | $ 11.5

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