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Mineral Properties - Guadalupe (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Jul. 31, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]          
Mineral properties, Net       $ 2,146 $ 2,146
Deferred option gain       68 $ 168
Gain (Loss) On Disposal Of Mineral Property Interests, Net       6,108  
Guadalupe De Los Reyes, Mexico | Option Agreement Two          
Property, Plant and Equipment [Line Items]          
Sale price of gold/silver project   $ 1,500      
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights       2,100  
Deferred option gain     $ 2,892    
Gain (Loss) On Disposal Of Mineral Property Interests, Net     $ 3,540    
Guadalupe De Los Reyes, Mexico | Option Agreement Two | Subsequent Event [Member]          
Property, Plant and Equipment [Line Items]          
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights $ 1,100        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-31 | Guadalupe De Los Reyes, Mexico | Option Agreement Two          
Property, Plant and Equipment [Line Items]          
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights       1,100  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-31 | Guadalupe De Los Reyes, Mexico | Option Agreement Two          
Property, Plant and Equipment [Line Items]          
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights       $ 1,000