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Accounts Payable and Accrued Expenses (FY) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jun. 30, 2024
Dec. 31, 2022
Payables and Accruals [Abstract]      
Accounts payable and other accrued liabilities $ 7,323   $ 9,561
Accrued employee expenses 13,859 $ 10,404 24,074
Accounts payable and accrued expenses 21,182 $ 18,563 33,635
Accrued bonuses 2,600   $ 9,900
Decrease in bonuses accruals 5,900    
Severance costs 3,600    
Decrease in other employee bonuses $ 600