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Strategic Alliance with Allseas and Affiliates - Lease liability and right-of-use asset (Details) - USD ($)
$ in Thousands
 5 Months Ended 12 Months Ended
Aug. 14, 2023
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Jul. 31, 2023
Lease Liability          
Lease liability, Beginning balance   $ 6,515      
Payments made on August 14, 2023, by issuing 4.15 million common shares   6,515      
Lease liability, Ending balance $ 6,500   $ 0    
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Fair Value Adjustment of Warrants       Fair Value Adjustment of Warrants
Right-of-use Asset          
Beginning Balance   6,515 5,721    
Lease Expense   794 1,907 $ 795  
Ending Balance   $ 5,721 $ 3,814 $ 5,721  
Number of shares issued to Allseas (in shares) 4,150,000        
Common Shares          
Right-of-use Asset          
Number of shares issued to Allseas (in shares) 4,150,000     15,000,000