v3.26.1
Revenue and Segment Information (Details 4) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Less: cost of sales $ (3,643) $ (626) $ (6,157) $ (1,401)
Segment gross profit (loss) 1,480 572 3,146 899
Personnel expenses 14,484 6,893 26,450 10,784
Professional fees 6,471 2,848 12,681 5,003
Other segment expenses 14,720 2,800 23,099 5,033
Segment operating loss (34,195) (11,969) (59,084) (19,921)
Foreign exchange transaction gain (loss) 2,628 (37) (1,098) (99)
Change in fair value of share liability 0 (142) 0 (129)
Change in fair value of investments     1,126  
Change in fair value of convertible notes payable (3,460) (63,757) (4,028) (64,715)
Interest income (expense), net 937 843 2,257 1,270
Loss before income tax expense (benefit) (34,090) (75,062) (60,827) (83,594)
Product Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue 4,523 1,198 8,503 2,300
Collaboration Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue 600   800  
Specialist isotopes and related services [Member]        
Segment Reporting [Line Items]        
Less: cost of sales (2,149) (626) (3,843) (1,401)
Segment gross profit (loss) 1,720 572 3,412 899
Personnel expenses 8,907 4,452 16,494 7,752
Professional fees 3,603 2,387 7,085 4,166
Other segment expenses 5,941 2,546 11,298 4,435
Segment operating loss (16,731) (8,813) (31,465) (15,454)
Foreign exchange transaction gain (loss) 66 (37) 27 (99)
Change in fair value of share liability   (142)   (129)
Change in fair value of investments     0  
Change in fair value of convertible notes payable 547 0 636 0
Interest income (expense), net 1,736 641 3,823 893
Loss before income tax expense (benefit) (14,382) (8,351) (26,979) (14,789)
Specialist isotopes and related services [Member] | Product Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue 3,869 1,198 7,255 2,300
Specialist isotopes and related services [Member] | Collaboration Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue 0   0  
Nuclear fuels [Member]        
Segment Reporting [Line Items]        
Less: cost of sales 0 0 0 0
Segment gross profit (loss) 600 0 800 0
Personnel expenses 4,492 2,441 7,740 3,032
Professional fees 2,176 461 4,373 837
Other segment expenses 5,598 254 6,509 598
Segment operating loss (11,666) (3,156) (17,822) (4,467)
Foreign exchange transaction gain (loss) (18) 0 (61) 0
Change in fair value of share liability   0   0
Change in fair value of investments     1,126  
Change in fair value of convertible notes payable (4,007) (63,757) (4,664) (64,715)
Interest income (expense), net 716 202 1,460 377
Loss before income tax expense (benefit) (14,975) (66,711) (19,961) (68,805)
Nuclear fuels [Member] | Product Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue 0 $ 0 0 $ 0
Nuclear fuels [Member] | Collaboration Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue 600   800  
Helium and LNG [Member]        
Segment Reporting [Line Items]        
Less: cost of sales (1,494)   (2,314)  
Segment gross profit (loss) (840)   (1,066)  
Personnel expenses 1,085   2,216  
Professional fees 692   1,223  
Other segment expenses 3,181   5,292  
Segment operating loss (5,798)   (9,797)  
Foreign exchange transaction gain (loss) 2,580   (1,064)  
Change in fair value of investments     0  
Change in fair value of convertible notes payable 0   0  
Interest income (expense), net (1,515)   (3,026)  
Loss before income tax expense (benefit) (4,733)   (13,887)  
Helium and LNG [Member] | Product Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue 654   1,248  
Helium and LNG [Member] | Collaboration Revenue [Member]        
Segment Reporting [Line Items]        
Sales from external customers/Collaboration revenue $ 0   $ 0