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Short-term and Other Investments - Summary (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 06, 2021 USD ($) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2021 USD ($) shares | Sep. 22, 2021 $ / shares | Dec. 31, 2020 USD ($) shares
Other Investments |  |  |  |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  |  | $ 5,788 |  |  |
Other investments, at fair value |  |  |  | $ 334 |  | $ 293
Midas Gold Shares [Member] |  |  |  |  |  |
Other Investments |  |  |  |  |  |
Number Marketable Securities Sold | shares |  | 4,667,615 | 6,882,115 |  |  |
Proceeds from Sale and Maturity of Marketable Securities |  | $ 4,835 | $ 5,788 |  |  |
Marketable Securities, Realized Gain (Loss) |  | $ 2,454 | $ 2,574 |  |  |
Nusantara Resources |  |  |  |  |  |
Other Investments |  |  |  |  |  |
Shares owned | shares |  |  |  | 1,333,334 |  | 1,333,334
Nusantara Resources |  |  |  |  |  |
Other Investments |  |  |  |  |  |
Sale of Stock, Price Per Share | $ / shares |  |  |  |  | $ 0.35 |
Subsequent Event [Member] | Nusantara Resources |  |  |  |  |  |
Other Investments |  |  |  |  |  |
Proceeds from Sale and Maturity of Marketable Securities | $ 339 |  |  |  |  |

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