v3.25.2
Redeemable Convertible Preferred Stock, Redeemable Common Stock, and Stockholders Equity (Deficit) - Restricted Stock Units Activity (Q2) (Details) - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Vested and not yet settled (in shares)   9,000  
Weighted- Average Fair Value Per Share      
Vested and not yet settled (usd per share)   $ 45.96  
Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Beginning balance (in shares)   15,455,000 0
Granted (in shares)   13,188,000 15,733,000
Vested (in shares)   (2,599,000) 0
Forfeited, expired, or canceled (in shares)   (367,000) (278,000)
Ending balance (in shares) 25,677,000 25,677,000 15,455,000
Outstanding (in shares) 25,686,000 25,686,000  
Weighted- Average Fair Value Per Share      
Beginning balance, Weighted average grant date fair value (usd per share)   $ 38.8 $ 0
Granted (usd per share)   62.39 38.56
Vested (usd per share)   33.36 0
Forfeited, expired, or canceled (usd per share)   36.57 25.18
Ending balance, Weighted average grant date fair value (usd per share) $ 51.5 51.5 $ 38.8
Outstanding (usd per share) $ 51.5 $ 51.5  
Restricted Stock      
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Granted (in shares) 1,602,257 1,602,257  
Ending balance (in shares) 1,460,477 1,460,477