v3.25.3
Accounting Policies - Going Concern (FY) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 24, 2025
Mar. 20, 2025
Jan. 30, 2025
Jan. 22, 2025
Jan. 07, 2025
Dec. 30, 2024
Dec. 24, 2024
Jan. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Oct. 01, 2024
Dec. 31, 2024
Dec. 31, 2023
Mar. 25, 2025
Dec. 31, 2022
Accounting Policies [Abstract]                                        
Cash, cash equivalents and restricted cash                 $ 11,965   $ 11,119 $ 2,081   $ 11,965 $ 2,081 $ 45 $ 11,119 $ 2,575   $ 7,544
Accumulated deficit                 305,512   78,262     305,512     78,262 64,284    
Working capital (deficit)                 (51,188)   (45,061)     (51,188)     (45,061)      
Net loss                 141,275 $ 253,674 70,093 $ 11,314 $ 7,526 394,949 18,840 28,198   30,984    
Subsequent Event [Line Items]                                        
Payment of debts                           1,176 $ 590          
Standby Equity Purchase Agreement                                        
Subsequent Event [Line Items]                                        
Amount received from stock issuance           $ 965 $ 770   0         931     $ 1,735      
Related party                                        
Subsequent Event [Line Items]                                        
Payment of debts                     $ 4,628         $ 0   $ 0    
Convertible debt | Convertible Debentures                                        
Subsequent Event [Line Items]                                        
Payment of debts                 $ 834         $ 834            
Aggregate principal amount, up to                                     $ 30,000  
Subsequent event | Standby Equity Purchase Agreement                                        
Subsequent Event [Line Items]                                        
Amount received from stock issuance     $ 235 $ 57 $ 633     $ 925                        
Subsequent event | Series C Preferred Stock                                        
Subsequent Event [Line Items]                                        
Amount received from stock issuance $ 1,500                                      
Stock purchase agreement, maximum amount $ 2,750                                      
Subsequent event | Related party                                        
Subsequent Event [Line Items]                                        
Payment of debts   $ 14,000                                    
Subsequent event | Convertible debt | Convertible Debentures                                        
Subsequent Event [Line Items]                                        
Aggregate principal amount, up to                                     $ 30,000