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Cash and Cash Equivalents and Short-term Investments (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Cash and Cash Equivalents, at Carrying Value $ 6,866 $ 9,704 $ 3,557 $ 4,593
Financial institutions minimum net worth 1,000,000      
Trading securities, cost 59 59    
Total short term, cost 59 59    
Total short term 117 79    
Frozen Bank Account Estimated Value 153,000      
Trading securities        
Trading securities, cost $ 59 $ 59    
Sale of Santa Maria Property | Options Agreement | Fabled Copper Corp.        
Consideration Received in Shares | shares 1,000,000 1,000,000    
Percentage of interest claims 100.00%      
Estimated Fair Value.        
Trading securities $ 117 $ 79    
Total short term 117 79    
Estimated Fair Value. | Trading securities        
Trading securities 117 79    
Carrying Value.        
Trading securities 117 79    
Total short term 117 79    
Carrying Value. | Trading securities        
Trading securities $ 117 $ 79