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Business and Organization (Q1) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Accumulated deficit $ 63,278 $ 64,518 $ 54,620
Cash $ 35,717 $ 34,350 $ 28,583