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INTANGIBLES - Schedule of Future Amortization Expense (Q1) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]      
2024 $ 45    
2025 60 $ 60  
2026 60 60  
2027 11 60  
Net $ 176 $ 191 $ 252