v3.25.2
Redeemable convertible preferred stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2024
May 31, 2022
Mar. 31, 2022
Oct. 31, 2019
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2025
Jun. 06, 2025
Dec. 31, 2023
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value                         $ 1,100,000    
Preferred Stock, Par or Stated Value Per Share                           $ 0.0001  
Preferred Stock, Convertible, Conversion Price                         $ 16.23    
Preferred Stock Convertible Minimum Conversion Price           $ 32.64                  
Proceeds From Stock Conversion           $ 150,000                  
Payments of Stock Issuance Costs         $ 268 3,870                  
Redeemable Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value           $ 1,100,000             $ 0    
Preferred Stock, Shares Issued           139,800,000             0    
Preferred Stock, Par or Stated Value Per Share           $ 0.0001             $ 0.0001    
Series A Redeemable Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value           $ 9,078                 $ 9,078
Preferred Stock, Shares Issued           33,621,000           33,600,000 33,621,000    
Preferred Stock, Par or Stated Value Per Share           $ 0.0001           $ 0.0001     $ 0.0001
Preferred Stock, Convertible, Conversion Price                       $ 0.27      
Proceeds from Issuance of Redeemable Preferred Stock                       $ 9,000      
Debt Instrument, Convertible, Liquidation Preference, Per Share           $ 0.27                  
Series B Redeemable Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value           $ 17,059                 $ 17,059
Preferred Stock, Shares Issued           17,586,000         17,600,000   17,586,000    
Preferred Stock, Par or Stated Value Per Share           $ 0.0001         $ 0.0001       $ 0.0001
Preferred Stock, Convertible, Conversion Price                     $ 0.97        
Proceeds from Issuance of Redeemable Preferred Stock                     $ 17,000        
Debt Instrument, Convertible, Liquidation Preference, Per Share           $ 0.97                  
Series C Redeemable Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value           $ 40,027                 $ 40,027
Preferred Stock, Shares Issued           18,445,000       23,100,000     18,445,000    
Preferred Stock, Par or Stated Value Per Share           $ 0.0001       $ 0.0001         $ 0.0001
Preferred Stock, Convertible, Conversion Price                   $ 2.17          
Proceeds from Issuance of Redeemable Preferred Stock                   $ 50,100          
Preferred Stock Shares Forfeited       4,600,000                      
Debt Instrument, Convertible, Liquidation Preference, Per Share           $ 2.17                  
Series D Redeemable Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value           $ 64,039                 $ 64,039
Preferred Stock, Shares Issued           23,203,000   23,200,000 23,200,000       23,203,000    
Preferred Stock, Par or Stated Value Per Share           $ 0.0001   $ 0.0001 $ 0.0001           $ 0.0001
Preferred Stock, Convertible, Conversion Price               $ 2.76 $ 2.76            
Proceeds from Issuance of Redeemable Preferred Stock               $ 64,100 $ 64,100            
Payments of Stock Issuance Costs               $ 100 $ 100            
Debt Instrument, Convertible, Liquidation Preference, Per Share           $ 2.76                  
Series E Redeemable Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value           $ 606,850                 $ 598,345
Preferred Stock, Shares Issued           37,391,000 9,100,000               36,867,000
Preferred Stock, Par or Stated Value Per Share           $ 0.0001 $ 0.0001               $ 0.0001
Preferred Stock, Convertible, Conversion Price $ 16.23   $ 16.23     $ 6,500,000 $ 16.23                
Proceeds from Issuance of Redeemable Preferred Stock             $ 148,900                
Conversion of Stock, Amount Converted $ 8,300   $ 451,000     $ 8,500                  
Conversion of Stock, Shares Converted 524,009   27,790                        
Equity, Fair Value Disclosure     $ 1,525,000     $ 15,000                  
Debt Instrument, Convertible, Liquidation Preference, Per Share           $ 16.23                  
Series F Redeemable Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Liquidation Preference, Value           $ 400,999                 $ 400,999
Preferred Stock, Shares Issued   9,500,000       9,516,000             9,516,000    
Preferred Stock, Par or Stated Value Per Share   $ 0.0001       $ 0.0001                 $ 0.0001
Preferred Stock, Convertible, Conversion Price   $ 42.14                          
Proceeds from Issuance of Redeemable Preferred Stock   $ 401,000                          
Debt Instrument, Convertible, Liquidation Preference, Per Share           42.14                  
Series E Convertible Preferred Stock [Member]                              
Class of Stock [Line Items]                              
Preferred Stock, Convertible, Conversion Price           $ 1,074,000,000