v3.26.3
Related Party Transactions - Related-Party Participation in Equity Financings (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 24, 2026
USD ($)
Jan. 23, 2026
USD ($)
entity
$ / shares
shares
Aug. 14, 2025
USD ($)
entity
$ / shares
shares
Jul. 31, 2026
USD ($)
May 31, 2026
USD ($)
note
Apr. 30, 2026
Sep. 30, 2025
Jun. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2026
USD ($)
shares
Jun. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
shares
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
shares
Feb. 13, 2025
shares
Related Party Transaction [Line Items]                              
Preferred stock, shares issued (in shares) | shares                 0     0   101,948,458  
Proceeds from issuance of redeemable preferred shares                       $ 70,000,020 $ 77,945,676    
Accounts payable                 $ 2,645,353     2,645,353   $ 2,082,547  
Early exercise liability, current                 831,340     831,340   0  
Early exercise liability, non-current                 1,170,548     1,170,548   $ 0  
Promissory Note                              
Related Party Transaction [Line Items]                              
Interest rate (as a percent)               4.07%              
Aggregate outstanding principal                 $ 0     $ 0      
Promissory Note | Recourse                              
Related Party Transaction [Line Items]                              
Amount pledged as a percentage of shares purchased (as a percent)         50.00%                    
Promissory Note | Nonrecourse                              
Related Party Transaction [Line Items]                              
Amount pledged as a percentage of shares purchased (as a percent)         50.00%                    
Chief Operating Officer                              
Related Party Transaction [Line Items]                              
Preferred stock, purchase price per share (in dollars per share) | $ / shares               $ 0.21              
Sale of stock, total purchase price               $ 453,600              
Chief Executive Officer                              
Related Party Transaction [Line Items]                              
Preferred stock, purchase price per share (in dollars per share) | $ / shares               $ 0.21              
Sale of stock, total purchase price               $ 719,250              
Ms. Marrocco | Promissory Note                              
Related Party Transaction [Line Items]                              
Promissory notes, principal amount               453,600              
Mr. Terrani | Promissory Note                              
Related Party Transaction [Line Items]                              
Promissory notes, principal amount               $ 719,250              
Mr. Harrill | Promissory Note                              
Related Party Transaction [Line Items]                              
Promissory notes, principal amount         $ 1,538,898                    
Interest rate (as a percent)         4.08%                    
Number of promissory notes | note         2                    
Series Seed-1                              
Related Party Transaction [Line Items]                              
Shares issued upon conversion (in shares) | shares                             65,000,000
Preferred stock, shares issued (in shares) | shares                 0     0   65,000,000  
Series A                              
Related Party Transaction [Line Items]                              
Preferred stock, shares issued (in shares) | shares     26,948,464           0     0   26,948,464  
Preferred stock, purchase price per share (in dollars per share) | $ / shares     $ 2.5976                        
Proceeds from issuance of redeemable preferred shares     $ 70,000,000.0                        
Number of affiliated entities | entity     2                        
Series A-2                              
Related Party Transaction [Line Items]                              
Preferred stock, shares issued (in shares) | shares   14,193,030             0     0      
Preferred stock, purchase price per share (in dollars per share) | $ / shares   $ 4.932                          
Proceeds from issuance of redeemable preferred shares   $ 70,000,000.0                          
Common Class B | Chief Operating Officer                              
Related Party Transaction [Line Items]                              
Stock issued during period, shares, new issues (in shares) | shares               2,160,000              
Common Class B | Chief Executive Officer                              
Related Party Transaction [Line Items]                              
Stock issued during period, shares, new issues (in shares) | shares               3,425,000              
Related Party                              
Related Party Transaction [Line Items]                              
Repayment of notes receivable from related parties       $ 2,773,933                      
Repayment of notes receivable from related parties, principal       2,711,748                      
Repayment of notes receivable from related parties, interest       $ 62,185                      
Investor rights agreement, ownership of company's stock, percentage   5.00%                          
Investor rights agreement, registration rights, term       5 years                      
Related Party | Promissory Note                              
Related Party Transaction [Line Items]                              
Equity instruments other than options, nonvested (in shares) | shares                 3,577,100     3,577,100      
Early exercise liability                 $ 2,000,000.0     $ 2,000,000.0      
Early exercise liability, current                 800,000     800,000      
Early exercise liability, non-current                 1,200,000     1,200,000      
Reclassification of liability to additional paid-in capital                 300,000            
Related Party | Framatome LLC                              
Related Party Transaction [Line Items]                              
License income                 0   $ 0 0 0    
Equipment lease income                 0   0 0 0    
Accounts payable                 100,000     100,000   $ 0  
Related Party | Neutroelectric, LLC                              
Related Party Transaction [Line Items]                              
Master services agreement, term             2 years                
Related party expenses $ 3,700,000                            
Related Party | Container Technologies Industries, LLC                              
Related Party Transaction [Line Items]                              
Costs and expenses, related party                   $ 100,000     0    
Reimbursement rate for allowable expenditures           50.00%                  
Time to request reimbursement from receipt of funds           5 days                  
Invoiced reimbursement amount                   $ 56,036     0    
Related Party | Ms. Marrocco                              
Related Party Transaction [Line Items]                              
Repayment of notes receivable from related parties       $ 473,043                      
Repayment of notes receivable from related parties, principal       453,600                      
Repayment of notes receivable from related parties, interest       19,443                      
Related Party | Mr. Terrani                              
Related Party Transaction [Line Items]                              
Repayment of notes receivable from related parties       750,654                      
Repayment of notes receivable from related parties, principal       719,250                      
Repayment of notes receivable from related parties, interest       31,404                      
Related Party | Mr. Harrill                              
Related Party Transaction [Line Items]                              
Repayment of notes receivable from related parties       1,550,236                      
Repayment of notes receivable from related parties, principal       1,538,898                      
Repayment of notes receivable from related parties, interest       $ 11,338                      
Related Party | Master Services Agreement                              
Related Party Transaction [Line Items]                              
Costs and expenses, related party                 $ 515,405   $ 0 $ 718,505 $ 0    
Related Party | Series Seed-1                              
Related Party Transaction [Line Items]                              
Shares issued upon conversion (in shares) | shares                             9,850,000
Related Party | Series A                              
Related Party Transaction [Line Items]                              
Preferred stock, purchase price per share (in dollars per share) | $ / shares     $ 2.5976                        
Proceeds from issuance of redeemable preferred shares     $ 8,800,000                        
Investment percentage in offering (as a percent)     12.60%                        
Related Party | Series A-2                              
Related Party Transaction [Line Items]                              
Preferred stock, purchase price per share (in dollars per share) | $ / shares   $ 4.932                          
Proceeds from issuance of redeemable preferred shares   $ 5,000,000.0                          
Investment percentage in offering (as a percent)   7.10%                          
Affiliated Entity | Series Seed-1                              
Related Party Transaction [Line Items]                              
Shares issued upon conversion (in shares) | shares                             9,850,000
Affiliated Entity | Series A-2                              
Related Party Transaction [Line Items]                              
Number of affiliated entities | entity   2