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Mineral Properties - Guadalupe (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
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Jun. 30, 2021 | Jan. 31, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2020
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Mineral properties, Net |  |  |  |  |  | $ 2,146 |  | $ 2,146 |
Deferred option gain |  |  |  |  |  | 383 |  | $ 68 |
Gain (Loss) On Disposal Of Mineral Property Interests, Net |  |  |  | $ 3,540 |  | $ 2,100 | $ 6,108 |  |
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
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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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