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Mineral Properties - Guadalupe (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jan. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Mineral properties, Net | $ 2,146 |  | $ 2,146 |  | $ 2,146 |  | $ 2,146
Deferred option gain | 248 |  | 248 |  | 248 |  | $ 68
Gain (Loss) On Disposal Of Mineral Property Interests, Net |  |  | 2,100 | $ 2,568 | 2,100 | $ 2,568 |
Guadalupe De Los Reyes, Mexico | Option Agreement Two |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Payments Receivable In Lieu Of Grant Of Royalty And Back-In Rights |  |  |  | $ 2,100 |  | $ 2,100 |
Payments Received In Lieu Of Grant Of Royalty And Back-In Rights | $ 1,000 | $ 1,100 |  |  |  |  |
Gain (Loss) On Disposal Of Mineral Property Interests, Net |  |  | $ 2,100 |  | $ 2,100 |  |

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