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Supplemental Cash Flow Information and Material Non-Cash Transactions (Details) - Nusantara Resources - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 01, 2019 | Dec. 31, 2019
Shares owned |  | 1,333,334
Investment Owned, at Fair Value |  | $ 272
Stock Received During Period, Shares, Consideration |  | 666,667
Number of shares not recognized earlier |  | 666,667
PT Masmindo Dwi Area | Awak Mas |  |
Stock Received During Period, Shares, Consideration | 666,667 |

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