v3.26.1
Revenue and Segment Information (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Less: cost of sales $ (4,047) $ (2,545)
Segment gross profit 1,627 1,599
Personnel expenses 29,573 13,590
Professional fees 15,052 7,740
Other segment expenses 17,373 6,623
Segment operating loss (60,371) (26,354)
Foreign exchange transaction (loss) gain (135) 70
Change in fair value of share liability (121) (132)
Change in fair value of convertible notes payable (123,719) (6,875)
Change in fair value of investments 580  
Interest income (expense), net 6,463 979
Other income 6 0
Loss before income tax expense (177,297) (32,312)
Product Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue 5,674 3,944
Collaboration Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue   200
Specialist isotopes and related services [Member]    
Segment Reporting Information [Line Items]    
Less: cost of sales (4,047) (2,545)
Segment gross profit 1,627 1,399
Personnel expenses 20,515 12,393
Professional fees 8,680 6,108
Other segment expenses 12,867 4,795
Segment operating loss (40,435) (21,897)
Foreign exchange transaction (loss) gain (132) 0
Change in fair value of share liability (121) 0
Change in fair value of convertible notes payable 1,500 0
Change in fair value of investments 580  
Interest income (expense), net 5,430 528
Other income 6  
Loss before income tax expense (33,172) (21,369)
Specialist isotopes and related services [Member] | Product Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue 5,674 3,944
Specialist isotopes and related services [Member] | Collaboration Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue   0
Nuclear fuels [Member]    
Segment Reporting Information [Line Items]    
Less: cost of sales 0 0
Segment gross profit 0 200
Personnel expenses 9,058 1,197
Professional fees 6,372 1,632
Other segment expenses 4,506 1,828
Segment operating loss (19,936) (4,457)
Foreign exchange transaction (loss) gain (3) 0
Change in fair value of share liability 0 0
Change in fair value of convertible notes payable (125,219) (6,875)
Change in fair value of investments 0  
Interest income (expense), net 1,033 451
Other income 0  
Loss before income tax expense (144,125) (10,881)
Nuclear fuels [Member] | Product Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue $ 0 0
Nuclear fuels [Member] | Collaboration Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue   200
Corporate [Member]    
Segment Reporting Information [Line Items]    
Less: cost of sales   0
Segment gross profit   0
Personnel expenses   0
Professional fees   0
Other segment expenses   0
Segment operating loss   0
Foreign exchange transaction (loss) gain   70
Change in fair value of share liability   (132)
Change in fair value of convertible notes payable   0
Interest income (expense), net   0
Loss before income tax expense   (62)
Corporate [Member] | Product Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue   0
Corporate [Member] | Collaboration Revenue [Member]    
Segment Reporting Information [Line Items]    
Sales from external customers/Collaboration revenue   $ 0