v3.26.1
Description of Organization, Business Operations and Liquidity (Details)
12 Months Ended
Oct. 15, 2025
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Sep. 29, 2025
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Jul. 30, 2025
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Nov. 13, 2024
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Oct. 02, 2024
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Jan. 25, 2024
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Jan. 10, 2024
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Oct. 17, 2022
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Jan. 26, 2021
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Dec. 31, 2025
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Nov. 30, 2025
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Dec. 31, 2024
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Nov. 30, 2024
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Jul. 31, 2025
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Jan. 11, 2024
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Description of Organization, Business Operations and Liquidity                                      
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            
Cash | $                     $ 1,301,928   $ 717            
Extension promissory notes - related party | $                     280,025   518,468            
Consideration received from sponsor | $                     $ 7,436,308   $ 233,667            
Preferred stock, par value (in dollars per share) | $ / shares                     $ 0.0001   $ 0.0001     $ 0.0001   $ 0.0001  
CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Purchase price, per unit | $ / shares               $ 10.25   $ 12.02                  
Gross proceeds | $               $ 235,800,000                      
Number of shares issued per right                   0.10                  
Warrants outstanding                   2,300,000   2,300,000              
One or more initial business combinations having an aggregate fair market value | item               1                      
Threshold minimum aggregate fair market value as a percentage of the net assets held in the Trust Account               80.00%                      
Threshold percentage of outstanding voting securities of the target to be acquired by post-transaction company to complete business combination               50.00%                      
Redemption limit percentage without prior consent               15                      
Obligation to redeem public shares if entity does not complete a business combination (as a percent)               100.00%                      
Period for consummation of business combination 45 months             15 months                      
Extended period for business combination             3 years                        
Additional fund deposited into trust account | $           $ 0                          
Net intangible assets | $             $ 5,000,001                   $ 5,000,001    
Notes payable | $                   $ 1,500,000   $ 1,500,000              
Trust Account | $       $ 25,135,029                              
Conversion ratio           1                          
Temporary equity, redemption price per share | $ / shares   $ 0.0001                                  
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares)           7,666,666                          
Cash | $                   154,890   495,352              
Working Capital | $                   2,400,000                  
Consideration received from sponsor | $                   25,000                  
Note payable - related party | $                   1,500,000                  
Loan amount converted into warrants | $                   1,500,000                  
Outstanding working capital loans | $                   $ 0   $ 0              
Ordinary shares subject to possible redemption, par value (in dollars per share) | $ / shares   $ 0.0001 $ 0.0001                                
Preferred stock, par value (in dollars per share) | $ / shares                   $ 0.0001   $ 0.0001              
Common Stock                                      
Description of Organization, Business Operations and Liquidity                                      
Common stock issued                     13,140,724   96,000,040            
Common Stock | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common stock issued   2,500,000 2,500,000                                
Purchase price, per unit | $ / shares   $ 12 $ 12                                
Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common shares, par value (in dollars per share) | $ / shares                   $ 0.0001   $ 0.0001              
Conversion ratio           1 1     1             1    
Common shares, shares issued (in shares)                   9,879,945   9,880,095              
Common shares, shares outstanding (in shares)       9,880,095   22,304,432       9,879,945   9,880,095              
Ordinary shares subject to possible redemption, shares outstanding (in shares)           14,637,766                          
Class A ordinary shares | Common Stock | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Ordinary shares exercised       12,424,337                              
Ordinary shares for cash at a redemption price | $ / shares       $ 11.43                              
Aggregate redemption amount | $       $ 142,010,171                              
Aggregate redemption amount | $       $ 142,085,423                              
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares)                       7,666,666              
Class A ordinary shares subject to possible redemption | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Aggregate redemption amount | $ $ 1,801           $ 90,726,471                        
Temporary equity, redemption price per share | $ / shares $ 11.93     $ 0.0001     $ 10.85     $ 12.02   $ 11.55              
Redemption of shares 151           8,362,234                        
Aggregate redemption amount | $ $ 1,801.43           $ 90,726,471     $ (1,801)   $ (232,811,894)              
Amount remaining in trust account | $ $ 26,404,398.04                                    
Common shares, shares outstanding (in shares)           14,637,766                          
Ordinary shares subject to possible redemption, shares outstanding (in shares) 2,213,278     2,075,000   14,637,766       2,213,278   2,213,429           23,000,000  
Ordinary shares subject to possible redemption, par value (in dollars per share) | $ / shares                   $ 0.0001   $ 0.0001              
Class B Ordinary Shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
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 | Common Stock | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares)                       (7,666,666)              
Series A Preferred Stock | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Consideration received from sponsor | $   $ 29,700,000 $ 29,700,000                                
Investor closing shares   29,700 29,700                                
Preferred stock, par value (in dollars per share) | $ / shares   $ 1,000 $ 1,000                                
Founder shares | Class B Ordinary Shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common stock, reserved for issuance upon consummation of business combination (in shares)                         691,666            
Related Party | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Note payable - related party | $                   $ 269,000                  
Sponsor | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares)           7,546,666                          
Monthly contribution to trust accounts per shares | $ / shares $ 0.01                                    
Threshold extension period 6 months                                    
Extension promissory notes - related party | $                   0   $ 0              
Sponsor | Common Stock | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common stock issued   3,100,000 3,100,000                                
Sponsor | Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common shares, shares outstanding (in shares)           7,546,666                          
Sponsor | Class A ordinary shares | Common Stock | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common shares, shares outstanding (in shares)           22,304,432                          
Sponsor | Class B Ordinary Shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common shares, shares issued (in shares)           1                          
Sponsor | Unsecured promissory note | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Notes payable | $         $ 1,500,000                            
Monthly contribution to trust account | $         $ 150,000   $ 150,000     150,000                  
Maximum aggregate amount | $             $ 3,150,000     $ 3,150,000                  
Monthly contribution to trust accounts per shares | $ / shares         $ 0.02                            
Sponsor | Unsecured promissory note | Class A ordinary shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Monthly contribution to trust accounts per shares | $ / shares         $ 0.02                            
Sponsor | Founder shares | Class B Ordinary Shares | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common stock issued                 5,750,000 40,000                  
Common shares, par value (in dollars per share) | $ / shares                 $ 0.0001                    
Consideration received from sponsor | $                 $ 25,000                    
Director | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
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                                      
Description of Organization, Business Operations and Liquidity                                      
Conversion of Class B ordinary shares to Class A ordinary shares not subject to possible redemption (in shares)           120,000                          
Common shares, shares outstanding (in shares)           120,000                          
Private Warrants | Sponsor | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Exercise price of warrants | $ / shares   $ 1 $ 1                                
Warrants outstanding   7,000,000 7,000,000                                
Initial Public Offering | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common stock issued               23,000,000                      
Gross proceeds | $               $ 230,000,000                      
Offering costs | $               13,400,000                      
Deferred underwriting commissions | $               $ 8,100,000                      
Number of shares issued per unit               1                      
Number of shares issued per right               0.10                      
Number of warrants in a unit               0.5                      
Period for consummation of business combination               36 months                      
Public share price (per share) | $ / shares               $ 10.25                      
Private Placement | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Sale of private placement warrants (in shares)               13,350,000                      
Price of warrant | $ / shares               $ 1                      
Proceeds from sale of private placement warrants | $               $ 13,400,000                      
Private Placement | Sponsor | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Warrants outstanding   7,000,000                                  
Over-allotment option | CIK_0001843477_Spring Valley Acquisition Corp. II                                      
Description of Organization, Business Operations and Liquidity                                      
Common stock issued               3,000,000                      
Purchase price, per unit | $ / shares               $ 10