v3.26.1
Summary of Significant Accounting Policies (Details)
1 Months Ended 2 Months Ended 9 Months Ended 12 Months Ended
Oct. 15, 2025
USD ($)
$ / shares
shares
Nov. 13, 2024
USD ($)
$ / shares
shares
Oct. 02, 2024
USD ($)
$ / shares
Jan. 10, 2024
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
Aug. 31, 2025
USD ($)
Dec. 31, 2023
shares
Feb. 29, 2024
Nov. 30, 2024
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Nov. 30, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Nov. 30, 2024
shares
Sep. 29, 2025
$ / shares
Jan. 25, 2024
shares
Jan. 11, 2024
Mar. 18, 2022
shares
Summary of Significant Accounting Policies                                  
Cash equivalents | $                     $ 0            
Common shares, shares outstanding (in shares)                 96,000,040   110,211,574   96,000,040        
Antidilutive securities excluded from computation of earnings per share                     0   0        
Statutory tax rate (as a percent)             21.00% 21.00% 21.00%   21.00%   21.00%        
CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Cash equivalents | $                   $ 0   $ 0          
Redemption price | $ / shares                           $ 0.0001      
Conversion ratio                             1    
Unrecognized tax benefits | $                   0   0          
Unrecognized tax benefits accrued for interest and penalties | $                   0   $ 0          
Trust Account | $   $ 25,135,029                              
Sponsor | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Monthly contribution to trust accounts per shares | $ / shares $ 0.01                                
Threshold extension period 6 months                                
Proceeds from Related Party Debt | $         $ 550,000 $ 550,000                      
Sponsor | Unsecured promissory note | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Monthly contribution to trust account | $     $ 150,000 $ 150,000           150,000              
Maximum aggregate amount | $       $ 3,150,000           3,150,000              
Promissory note, borrowed amount | $                   1,500,000              
Monthly contribution to trust accounts per shares | $ / shares     $ 0.02                            
Proceeds from Related Party Debt | $                   $ 1,500,000              
Rights | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Antidilutive securities excluded from computation of earnings per share                   2,300,000              
Public Warrants and Private Placement Warrants | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Antidilutive securities excluded from computation of earnings per share                   24,850,000              
Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Shares outstanding                   9,880,095              
Ordinary shares subject to possible redemption, shares outstanding (in shares)                             14,637,766    
Common shares, shares outstanding (in shares)   9,880,095               9,879,945   9,880,095     22,304,432    
Conversion ratio       1           1         1 1  
Class A ordinary shares | Sponsor | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Common shares, shares outstanding (in shares)                             7,546,666    
Class A ordinary shares | Sponsor | Unsecured promissory note | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Monthly contribution to trust accounts per shares | $ / shares     $ 0.02                            
Class A ordinary shares | Common Stock | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Aggregate redemption amount | $   $ 142,085,423                              
Redemption Price per Share | $ / shares   $ 11.43                              
Ordinary shares exercised   12,424,337                              
Class A ordinary shares | Common Stock | Sponsor | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Common shares, shares outstanding (in shares)                             22,304,432    
Class B Ordinary Shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Common shares, shares outstanding (in shares)                   1   1         7,666,667
Class A ordinary shares subject to possible redemption | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Ordinary shares subject to possible redemption, shares outstanding (in shares) 2,213,278 2,075,000         23,000,000     2,213,278   2,213,429     14,637,766    
Redemption of shares 151     8,362,234                          
Aggregate redemption amount | $ $ 1,801.43     $ 90,726,471           $ (1,801)   $ (232,811,894)          
Redemption price | $ / shares $ 11.93 $ 0.0001   $ 10.85           $ 12.02   $ 11.55          
Common shares, shares outstanding (in shares)                             14,637,766    
Class A ordinary shares subject not to possible redemption | CIK_0001843477_Spring Valley Acquisition Corp. II                                  
Summary of Significant Accounting Policies                                  
Common shares, shares outstanding (in shares)                   7,666,666