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Summary of Significant Accounting Policies (Details) - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Oct. 02, 2014
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Palmarejo gold production royalty |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Aggregate deposit to be received |  |  |  |  |  |  |  | $ 22,000,000.0
Production to be sold, percent |  |  |  |  |  |  |  | 50.00%
Price per ounce under agreement |  |  |  |  |  |  |  | $ 800
Kensington |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenue liability | $ 15,006,000 | $ 8,018,000 | $ 15,010,000 | $ 25,000,000.0 | $ 25,021,000 | $ 0 | $ 0 |

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