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Condensed Consolidated Statements of Changes in Convertible Preferred Units and Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Conversion of convertible preferred units to common stock in connection with IPO
Conversion of convertible notes and related party terms loans to common stock in connection with IPO
Conversion of Common Units to common stock in connection with IPO
IPO
Private Placement
Common Units
Common Units
Conversion of Common Units to common stock in connection with IPO
Common Stock
Common Stock
Conversion of convertible preferred units to common stock in connection with IPO
Common Stock
Conversion of convertible notes and related party terms loans to common stock in connection with IPO
Common Stock
Conversion of Common Units to common stock in connection with IPO
Common Stock
IPO
Common Stock
Private Placement
Treasury Stock
Additional Paid-In Capital
Additional Paid-In Capital
Conversion of convertible preferred units to common stock in connection with IPO
Additional Paid-In Capital
Conversion of convertible notes and related party terms loans to common stock in connection with IPO
Additional Paid-In Capital
Conversion of Common Units to common stock in connection with IPO
Additional Paid-In Capital
IPO
Additional Paid-In Capital
Private Placement
Accumulated Other Comprehensive Income
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Beginning balance $ (644,303)           $ 0   $ 0           $ 0 $ 656,495           $ 1,096 $ (1,301,894)
Beginning balance (in shares) at Dec. 31, 2023 39,842                                            
Beginning balance at Dec. 31, 2023 $ 534,368                                            
Ending balance (in shares) at Sep. 30, 2024 39,842                                            
Ending balance at Sep. 30, 2024 $ 534,368                                            
Beginning common balance (in shares) at Dec. 31, 2023             49,694   0                            
Beginning treasury balance (in shares) at Dec. 31, 2023                             0                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Issuance of Common Units due to equity awards granted, net of forfeitures (in shares)             1,113                                
Stock-based compensation 4,483                             4,483              
Net loss (131,552)                                           (131,552)
Other comprehensive income 3,424                                         3,424  
Ending common balance (in shares) at Sep. 30, 2024             50,807   0                            
Ending treasury balance (in shares) at Sep. 30, 2024                             0                
Ending balance at Sep. 30, 2024 (767,948)           $ 0   $ 0           $ 0 660,978           4,520 (1,433,446)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Beginning balance $ (681,934)           $ 0   $ 0           $ 0 659,640           1,692 (1,343,266)
Beginning balance (in shares) at Jun. 30, 2024 39,842                                            
Beginning balance at Jun. 30, 2024 $ 534,368                                            
Ending balance (in shares) at Sep. 30, 2024 39,842                                            
Ending balance at Sep. 30, 2024 $ 534,368                                            
Beginning common balance (in shares) at Jun. 30, 2024             50,259   0                            
Beginning treasury balance (in shares) at Jun. 30, 2024                             0                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Issuance of Common Units due to equity awards granted, net of forfeitures (in shares)             548                                
Stock-based compensation 1,338                             1,338              
Net loss (90,180)                                           (90,180)
Other comprehensive income 2,828                                         2,828  
Ending common balance (in shares) at Sep. 30, 2024             50,807   0                            
Ending treasury balance (in shares) at Sep. 30, 2024                             0                
Ending balance at Sep. 30, 2024 (767,948)           $ 0   $ 0           $ 0 660,978           4,520 (1,433,446)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Beginning balance (767,948)           0   0           0 660,978           4,520 (1,433,446)
Beginning balance $ (795,362)           $ 0   $ 0           $ 0 662,091           2,987 (1,460,440)
Beginning balance (in shares) at Dec. 31, 2024 39,842                                            
Beginning balance at Dec. 31, 2024 $ 534,368                                            
Increase (Decrease) in Temporary Equity [Roll Forward]                                              
Conversion of convertible preferred units to common stock in connection with IPO (in shares) (39,842)                                            
Conversion of convertible preferred units to common stock in connection with IPO $ (534,368)                                            
Ending balance (in shares) at Sep. 30, 2025 0                                            
Ending balance at Sep. 30, 2025 $ 0                                            
Beginning common balance (in shares) at Dec. 31, 2024             50,761   0                            
Beginning treasury balance (in shares) at Dec. 31, 2024 0                           0                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Issuance of Common Units due to equity awards granted, net of forfeitures (in shares)             20,497                                
Issuance of common stock (in shares)                         15,479 1,905                  
Issuance of common stock         $ 391,164 $ 50,000             $ 15 $ 2           $ 391,149 $ 49,998    
Conversion in connection with IPO (in shares)               (71,258)   54,541 31,056 14,403                      
Conversion in connection with IPO   $ 534,369 $ 869,568 $ (37)           $ 55 $ 31 $ 15         $ 534,314 $ 869,537 $ (52)        
Issuance of common stock upon settlement of stock awards, net of shares withheld (in shares)                 262                            
Issuance of common stock upon settlement of stock awards, net of shares withheld $ (6,929)                             (6,929)              
Shares withheld for employee tax withholdings (in shares)                             (23)                
Shares withheld for employee tax withholdings (568)                           $ (568)                
Stock-based compensation 48,959                             48,959              
Net loss (441,990)                                           (441,990)
Other comprehensive income $ 4,388                                         4,388  
Ending common balance (in shares) at Sep. 30, 2025             0   117,646                            
Ending treasury balance (in shares) at Sep. 30, 2025 (23)                           (23)                
Ending balance at Sep. 30, 2025 $ 653,562           $ 0   $ 118           $ (568) 2,549,067           7,375 (1,902,430)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Beginning balance $ (1,069,450)           $ 0   $ 0           $ 0 665,299           8,167 (1,742,916)
Beginning balance (in shares) at Jun. 30, 2025 39,842                                            
Beginning balance at Jun. 30, 2025 $ 534,368                                            
Increase (Decrease) in Temporary Equity [Roll Forward]                                              
Conversion of convertible preferred units to common stock in connection with IPO (in shares) (39,842)                                            
Conversion of convertible preferred units to common stock in connection with IPO $ (534,368)                                            
Ending balance (in shares) at Sep. 30, 2025 0                                            
Ending balance at Sep. 30, 2025 $ 0                                            
Beginning common balance (in shares) at Jun. 30, 2025             68,383   0                            
Beginning treasury balance (in shares) at Jun. 30, 2025                             0                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Issuance of Common Units due to equity awards granted, net of forfeitures (in shares)             2,875                                
Issuance of common stock (in shares)                         15,479 1,905                  
Issuance of common stock         $ 391,164 $ 50,000             $ 15 $ 2           $ 391,149 $ 49,998    
Conversion in connection with IPO (in shares)               (71,258)   54,541 31,056 14,403                      
Conversion in connection with IPO   $ 534,369 $ 869,568 $ (37)           $ 55 $ 31 $ 15         $ 534,314 $ 869,537 $ (52)        
Issuance of common stock upon settlement of RSUs, net of shares withheld (in shares)                 262                            
Issuance of common stock upon settlement of RSUs, net of shares withheld (6,929)                             (6,929)              
Shares withheld for employee tax withholdings (in shares)                             (23)                
Shares withheld for employee tax withholdings (568)                           $ (568)                
Stock-based compensation 45,751                             45,751              
Net loss (159,514)                                           (159,514)
Other comprehensive income $ (792)                                         (792)  
Ending common balance (in shares) at Sep. 30, 2025             0   117,646                            
Ending treasury balance (in shares) at Sep. 30, 2025 (23)                           (23)                
Ending balance at Sep. 30, 2025 $ 653,562           $ 0   $ 118           $ (568) 2,549,067           7,375 (1,902,430)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                              
Beginning balance $ 653,562           $ 0   $ 118           $ (568) $ 2,549,067           $ 7,375 $ (1,902,430)