v3.25.2
Debt - 2021 Convertible Senior Secured Notes (FY) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 17, 2024
Apr. 30, 2022
Oct. 31, 2021
Oct. 30, 2021
Apr. 30, 2021
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oct. 31, 2023
Apr. 30, 2023
Debt Instrument [Line Items]                              
Unamortized debt discounts and issuance costs           $ 119,984   $ 119,984   $ 107,137 $ 31,795        
Interest expense           256,162 $ 67,097 513,533 $ 107,600 349,203 26,967 $ 8,374      
PIK interest                   0 21,621 0      
Amortization of debt discounts and issuance costs           $ 29,036 7,547 $ 66,727 15,605 33,376 16,533 3,803      
Debt extinguishment loss                   11,708 0 0      
Senior Notes                              
Debt Instrument [Line Items]                              
Maturity date                         Oct. 18, 2025    
2021 Convertible Senior Secured Notes                              
Debt Instrument [Line Items]                              
Debt conversion original debt amount     $ 675,000                        
Debt instrument convertible conversion price     $ 2.2                        
2021 Convertible Senior Secured Notes | Senior Notes                              
Debt Instrument [Line Items]                              
Principal amount     $ 50,000               55,000        
Proceeds from issuance of debt   $ 30,000 $ 20,000                        
Debt instrument interest rate increase     16.00%                        
Debt instrument, term                         3 years    
Debt instrument, principal amount to redeem     $ 15,000                        
Debt instrument percentage of principal amount redeem     20.00%                        
Percentage of adjustment to conversion price to price per share offered to public in initial public offering     75.00%                        
Percentage of adjustment to conversion price to stock price after closing of a direct listing     75.00%                        
Percentage of adjustment to conversion price to stock valuation derived from special purpose acquisition company transaction     75.00%                        
Bifurcated embedded derivative liabilities   $ 2,000 $ 0                        
Estimated fair value of notes                     451,000        
Accreted redemption premiums                     6,000        
Unamortized debt discounts and issuance costs                     2,000        
Bifurcation required embedded derivative liabilities                     386,000        
Change in fair value             262,000   344,000 627,000 361,000 3,000      
Interest expense             3,000   6,000 8,000 31,000 7,000      
Interest expense, coupon rate             1,000   3,000 4,000 5,000 4,000      
PIK interest                   0 22,000 0      
Amortization of debt discounts and issuance costs             $ 2,000   $ 3,000 $ 4,000 $ 4,000 $ 3,000      
Convertible notes, shares converted (in shares) 24,543,980                            
Payment of accrued interest and cash in lieu of fractional shares $ 2,000                            
Fair value of common shares issued upon conversion of debt 1,100,000                            
Debt extinguishment loss $ 6,000                            
2021 Convertible Senior Secured Notes | Senior Notes | Maximum                              
Debt Instrument [Line Items]                              
Principal amount     $ 50,000                        
2021 Convertible Senior Secured Notes | Payment-in-Kind ("PIK")                              
Debt Instrument [Line Items]                              
Principal amount                           $ 5,000 $ 5,000
Interest rate     10.00%                        
Debt instrument payment term       semiannually semiannually