v3.26.1
Related Party Transactions - Founder Shares (Details)
 12 Months Ended
Jan. 25, 2024
shares
Oct. 17, 2022
USD ($)
shares
Mar. 18, 2022
shares
Jan. 26, 2021
USD ($)
$ / shares
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Nov. 30, 2025
USD ($)
$ / shares
shares
Nov. 30, 2024
USD ($)
$ / shares
shares
Jul. 31, 2025
$ / shares
Dec. 31, 2024
$ / shares
shares
Nov. 13, 2024
shares
Oct. 17, 2024
$ / shares
Feb. 29, 2024
$ / shares
Jan. 11, 2024
$ / shares
Jan. 10, 2024
$ / shares
Dec. 31, 2023
$ / shares
Related Party Transactions                              
Common shares, par value (in dollars per share) | $ / shares           $ 0.0001 $ 0.0001 $ 0.0001     $ 0.0001 $ 0.0001     $ 0.0001
Consideration received from sponsor | $           $ 7,436,308 $ 233,667                
Common shares, shares outstanding (in shares)           110,211,574 96,000,040                
CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Consideration received from sponsor | $         $ 25,000                    
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares) 7,666,666                            
Conversion ratio 1                            
Over-allotment option | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Issuance of common shares (in shares)   3,000,000                          
Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Common shares, par value (in dollars per share) | $ / shares         $ 0.0001       $ 0.0001            
Common shares, shares outstanding (in shares) 22,304,432       9,879,945       9,880,095 9,880,095          
Conversion ratio 1       1               1 1  
Class B ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Common shares, par value (in dollars per share) | $ / shares         $ 0.0001       $ 0.0001       $ 0.0001 $ 0.0001  
Common shares, shares outstanding (in shares)     7,666,667   1       1            
Sponsor | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Recognized stock based compensation expense | $   $ 0     $ 0                    
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares) 7,546,666                            
Sponsor | Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Common shares, shares outstanding (in shares) 7,546,666                            
Sponsor | Class B ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Percentage of shares allowed for transfer         80.00%                    
Director | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares) 120,000                            
Director | Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
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                            
Founder shares | Class B ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Shares capitalized for future     1,916,667                        
Shares subject to forfeiture     1,000,000                        
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders     25.00%                        
Restrictions on transfer period of time after business combination completion         1 year                    
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share) | $ / shares         $ 12                    
Threshold trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination         20 days                    
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination         30 days                    
Threshold period after the business combination in which the 20 trading days within any 30 trading day period commences         120 days                    
Founder shares | Class B ordinary shares | Over-allotment option | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Number of shares no longer subject to forfeiture   1,000,000                          
Founder shares | Sponsor | Class B ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                              
Related Party Transactions                              
Issuance of common shares (in shares)       5,750,000 40,000                    
Common shares, par value (in dollars per share) | $ / shares       $ 0.0001                      
Consideration received from sponsor | $       $ 25,000                      
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders         25.00%                    
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share) | $ / shares         $ 12.5                    
Threshold trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination         20 days                    
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination         30 days                    
Shares granted         120,000                    
Share granted value | $         $ 452,000                    
Amount granted per share | $ / shares         $ 3.77                    
Risk-free interest rate         0.30%                    
Expected term (in years)         3 years 11 months 15 days