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Financing Activity - Registered direct offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 06, 2025
Nov. 27, 2024
Nov. 26, 2024
Nov. 14, 2024
Nov. 13, 2024
Jan. 31, 2024
Jan. 30, 2024
Aug. 14, 2023
Financing Activity                    
Proceeds from registered direct offering $ 23,900 $ 15,923                
Expenses paid for Registered Direct Offering 357 $ 1,182                
Subsequent event                    
Financing Activity                    
Remaining committed fund     $ 5,000              
Class A Warrant                    
Financing Activity                    
Exercise price of warrants           $ 2 $ 3      
Class B Warrants | Subsequent event                    
Financing Activity                    
Number of shares agreed to sell and issue     2,500,000              
Common Shares | Subsequent event                    
Financing Activity                    
Number of shares agreed to sell and issue     5,000,000              
2023 Registered Direct Offering                    
Financing Activity                    
Exercise price of warrants               $ 3    
Remaining committed fund 23,600               $ 9,000  
Proceeds from registered direct offering 24,900                  
Expenses paid for Registered Direct Offering 1,300                  
Net proceeds from Registered Direct Offering 23,600                  
2023 Registered Direct Offering | Class A Warrant                    
Financing Activity                    
Number of shares agreed to sell and issue                 2,250,000  
Share price                   $ 2
Exercise price of warrants                   $ 3
Remaining committed fund 4,700                  
2023 Registered Direct Offering | Common Shares                    
Financing Activity                    
Number of shares agreed to sell and issue                 4,500,000 12,461,540
Remaining committed fund 18,900                  
2023 Registered Direct Offering | Common Shares | Class A Warrant                    
Financing Activity                    
Number of shares agreed to sell and issue                   6,230,770
2024 Registered Direct Offering                    
Financing Activity                    
Remaining committed fund 14,200                  
Proceeds from registered direct offering 14,900                  
Expenses paid for Registered Direct Offering 700                  
Net proceeds from Registered Direct Offering $ 14,200                  
2024 Registered Direct Offering | Class B Warrants                    
Financing Activity                    
Share price           1        
Exercise price of warrants $ 2         $ 2        
Remaining committed fund $ 4,500                  
2024 Registered Direct Offering | Common Shares                    
Financing Activity                    
Number of shares agreed to sell and issue 14,900,000     19,900,000 2,400,000 17,500,000        
Remaining committed fund $ 9,700                  
2024 Registered Direct Offering | Common Shares | Class B Warrants                    
Financing Activity                    
Number of shares agreed to sell and issue 7,450,000     9,950,000 1,200,000 8,750,000