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MERGER TRANSACTION COSTS PAYABLE (Q1) (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Other Liabilities Disclosure [Abstract]    
Merger Transaction Costs
Merger transaction cost payable consist of the following as of December 31, 2023, in thousands:

 
December 31, 2023
Transaction costs payable in common stock
$4,250
Total
$4,250
Merger transaction cost payable consist of the following as of December 31, 2023 and 2022, in thousand:
 
December 31,
2023
December 31,
2022
Transaction costs payable in common stock
$4,250
$—
Total
$4,250
$—