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Stockholders' Equity - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 23, 2023
Apr. 26, 2022
Apr. 20, 2022
Apr. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Other disclosures            
Compensation expense         $ 220 $ 720
Operating cost           $ 620
Authorized number of shares         51,000,000  
Number of common stock shares authorized         50,000,000 50,000,000
Authorized number of shares of preferred stock         1,000,000 1,000,000
Contra-revenue related to warrants granted to licensee         $ 26  
Employee            
Other disclosures            
Compensation expense         $ 20 $ 410
Non Management Directors            
Other disclosures            
Compensation expense           $ 310
Employee Stock Option [Member]            
Number of Options            
Outstanding, beginning balance (in shares)         5,614,310  
Granted (in shares)         200,000  
Exercised (in shares)         (87,750)  
Expired/Forfeited (in shares)         (578,020)  
Outstanding, ending balance (in shares)         5,148,540 5,614,310
Exercisable (in shares)         1,398,540  
Weighted Average Exercise Price            
Outstanding, beginning balance (in dollars per share)         $ 2.12  
Granted (in dollars per share)         1.51  
Exercised (in dollars per share)         0.80  
Expired/Forfeited (in dollars per share)         2.96  
Outstanding, ending balance (in dollars per share)         2.03 $ 2.12
Exercisable (in dollars per share)         $ 2.88  
Other disclosures            
Outstanding Weighted Average Remaining Contractual Life (in Years)         4 years 3 months 3 days 4 years 9 months 3 days
Exercisable Weighted Average Remaining Contractual Life (in Years)         1 year 7 months 28 days  
Vested (in shares)         135,000  
Compensation expense         $ 100 $ 500
Unrecognized compensation expense           $ 100
Weighted average period of recognition           1 year 18 days
Employee Stock Option [Member] | Employee            
Number of Options            
Granted (in shares)     380,850      
Weighted Average Exercise Price            
Granted (in dollars per share)     $ 1.62      
Employee Stock Option [Member] | Non Management Directors            
Number of Options            
Granted (in shares) 100,000     100,000    
Weighted Average Exercise Price            
Granted (in dollars per share) $ 1.51     $ 1.50    
Other disclosures            
Vested (in shares)         0  
Vesting rights (percentage per year) 50.00%          
Employee Stock Option [Member] | Management            
Number of Options            
Granted (in shares)     125,000      
Weighted Average Exercise Price            
Granted (in dollars per share)     $ 1.62      
Employee Stock Option [Member] | Consultant            
Number of Options            
Granted (in shares)   100,000        
Weighted Average Exercise Price            
Granted (in dollars per share)   $ 1.58        
Employee Stock Option [Member] | Five year expiration            
Stockholders' Equity            
Expiration period         5 years  
Employee Stock Option [Member] | Seven year expiration            
Stockholders' Equity            
Expiration period         7 years  
Employee Stock Option [Member] | Ten year expiration            
Stockholders' Equity            
Expiration period         10 years