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Warrants - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 06, 2025
Feb. 29, 2020
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2020
Dec. 31, 2024
Mar. 02, 2022
Class Of Warrant Or Right [Line Items]                  
Number of warrants outstanding     2,680,607   2,680,607     2,680,607  
Change in fair value of derivative warrant liabilities     $ 181,955 $ (1,200) $ 149,250 $ (717)      
Proceeds from warrant exercised         $ 3,000        
Series C Redeemable Convertible Preferred Stock                  
Class Of Warrant Or Right [Line Items]                  
Number of warrants outstanding     777,118   777,118     793,800  
Number of warrants exercised     0   16,682        
Adjustment to additional paid in capital warrants issued         $ 1,200        
Series C Preferred Stock                  
Class Of Warrant Or Right [Line Items]                  
Exercise price of warrants             $ 1.15    
Proceeds from sale of common stock through Purchase Agreement             $ 56,200    
Series C Preferred Stock | Series C Redeemable Convertible Preferred Stock                  
Class Of Warrant Or Right [Line Items]                  
Class Of Warrants Or Rights Warrants Issued During The Period             5,248,183    
Series C Preferred Stock | Post Conversion                  
Class Of Warrant Or Right [Line Items]                  
Proceeds from sale of common stock through Purchase Agreement (in shares)             54,500,000    
Public Warrants                  
Class Of Warrant Or Right [Line Items]                  
Class of warrants issued during period     1   1        
Number of warrants outstanding     11,704,886   11,704,886     11,082,870  
Derivative liabilities     $ 214,300   $ 214,300     $ 70,300  
Change in fair value of derivative warrant liabilities     $ 162,800 (500) $ 134,000 (400)      
Number of warrants exercised     221,118   260,912        
Exercise price of warrants     $ 11.5   $ 11.5       $ 11.5
Proceeds from warrant exercised     $ 2,500   $ 3,000        
Proceeds from underlying warrant derivative liabilities settled     $ 1,300   $ 1,600        
Number of trading days for determining the share price         10 days        
Public Warrants | Subsequent Event                  
Class Of Warrant Or Right [Line Items]                  
Number of warrants exercised 4,042,099                
Proceeds from warrant exercised $ 46,500                
Public Warrants | Price per share of common stock equals or exceeds $18.00                  
Class Of Warrant Or Right [Line Items]                  
Class of warrant or right redemption of warrants trigger price     $ 18   $ 18        
Redemption price per share or per unit of warrants or rights outstanding     0.01   0.01        
Public Warrants | Price per share of common stock equals or exceeds $10.00                  
Class Of Warrant Or Right [Line Items]                  
Class of warrant or right redemption of warrants trigger price     10   10        
Redemption price per share or per unit of warrants or rights outstanding     $ 0.1   $ 0.1        
Public Warrants | Maximum                  
Class Of Warrant Or Right [Line Items]                  
Class of warrants issued during period     0.361   0.361        
Public Warrants | Minimum                  
Class Of Warrant Or Right [Line Items]                  
Class of warrants issued during period     0.034   0.034        
Private Warrants                  
Class Of Warrant Or Right [Line Items]                  
Number of warrants outstanding     1,109,174   1,109,174     1,992,102  
Derivative liabilities     $ 26,400   $ 26,400     $ 22,800  
Change in fair value of derivative warrant liabilities     19,100 $ (700) 15,300 $ (300)      
Warrants To Purchase Class A Common Stock | Series C Redeemable Convertible Preferred Stock                  
Class Of Warrant Or Right [Line Items]                  
Exercise price of warrants             $ 0.01    
Warrants and rights outstanding, term             10 years    
Customer Warrants | Class A Ordinary Shares                  
Class Of Warrant Or Right [Line Items]                  
Exercise price of warrants   $ 1.152              
Warrants and rights outstanding, term   10 years              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   2,680,607              
Deferred assets in connection with warrants issued to Customer     100   100     $ 100  
Class of warrant or right, Grant date fair value     $ 200   $ 200        
Customer Warrants | Class A Ordinary Shares | Maximum                  
Class Of Warrant Or Right [Line Items]                  
Class Of Warrants Vesting Percentage   100.00%              
Customer Warrants | Class A Ordinary Shares | Minimum                  
Class Of Warrant Or Right [Line Items]                  
Class Of Warrants Vesting Percentage   50.00%