v3.24.2
FAIR VALUE MEASUREMENT, Derivative Liability (FY) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Derivative Liability [Roll Forward]        
Estimated fair value $ 18,402,800 $ 14,905,300 $ 14,905,300 $ 75,355,200
Change in fair value of derivative liabilities 225,916,000 $ (5,659,900) 2,791,600 (75,809,900)
Additions from new convertible notes     705,900 15,360,000
Estimated fair value $ 244,318,900   $ 18,402,800 $ 14,905,300