v3.26.1
Shareholders' Deficit - Ordinary Shares (Details)
12 Months Ended
Jan. 25, 2024
USD ($)
shares
Dec. 31, 2025
$ / shares
shares
Nov. 30, 2025
$ / shares
shares
Oct. 15, 2025
shares
Jul. 31, 2025
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Nov. 30, 2024
$ / shares
shares
Nov. 13, 2024
shares
Oct. 17, 2024
$ / shares
Feb. 29, 2024
$ / shares
shares
Jan. 11, 2024
$ / shares
Jan. 10, 2024
$ / shares
Dec. 31, 2023
$ / shares
shares
Mar. 18, 2022
shares
Shareholders' Deficit                            
Common shares, shares authorized (in shares)     350,000,000       350,000,000     350,000,000     350,000,000  
Common shares, par value (in dollars per share) | $ / shares     $ 0.0001   $ 0.0001   $ 0.0001   $ 0.0001 $ 0.0001     $ 0.0001  
Common shares, shares issued (in shares)     110,211,574       96,000,040              
Common shares, shares outstanding (in shares)     110,211,574       96,000,040              
Ordinary shares subject to possible redemption, shares issued (in shares)     15,951,675   15,951,675                  
CIK_0001843477_Spring Valley Acquisition Corp. II                            
Shareholders' Deficit                            
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares) 7,666,666                          
Conversion ratio 1                          
Additional fund deposited into trust account | $ $ 0                          
Number of rights outstanding   2,300,000       2,300,000                
Number of shares issued per right   0.10                        
Number of shares issuable per right, if company will not be survivor upon completion of business combination   1                        
Fractional shares issued upon conversion of rights   0                        
CIK_0001843477_Spring Valley Acquisition Corp. II | Sponsor                            
Shareholders' Deficit                            
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares) 7,546,666                          
CIK_0001843477_Spring Valley Acquisition Corp. II | Director                            
Shareholders' Deficit                            
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares) 120,000                          
Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                            
Shareholders' Deficit                            
Common shares, shares authorized (in shares)   300,000,000       300,000,000                
Common shares, par value (in dollars per share) | $ / shares   $ 0.0001       $ 0.0001                
Common shares, shares issued (in shares)   9,879,945       9,880,095                
Common shares, shares outstanding (in shares) 22,304,432 9,879,945       9,880,095   9,880,095            
Ordinary shares subject to possible redemption, shares outstanding (in shares) 14,637,766                          
Conversion ratio 1 1                 1 1    
Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II | Sponsor                            
Shareholders' Deficit                            
Common shares, shares outstanding (in shares) 7,546,666                          
Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II | Director                            
Shareholders' Deficit                            
Common shares, shares outstanding (in shares) 120,000                          
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares) 120,000                          
Class A ordinary shares subject to possible redemption | CIK_0001843477_Spring Valley Acquisition Corp. II                            
Shareholders' Deficit                            
Common shares, shares outstanding (in shares) 14,637,766                          
Ordinary shares subject to possible redemption, shares issued (in shares)   2,213,278       2,213,429                
Ordinary shares subject to possible redemption, shares outstanding (in shares) 14,637,766 2,213,278   2,213,278   2,213,429   2,075,000         23,000,000  
Class B ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                            
Shareholders' Deficit                            
Common shares, shares authorized (in shares)   30,000,000       30,000,000                
Common shares, par value (in dollars per share) | $ / shares   $ 0.0001       $ 0.0001         $ 0.0001 $ 0.0001    
Common shares, shares issued (in shares)   1       1                
Common shares, shares outstanding (in shares)   1       1               7,666,667
Class B ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II | Sponsor                            
Shareholders' Deficit                            
Common shares, shares issued (in shares) 1