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Mineral Properties - Awak Mas (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018
PT Masmindo Dwi Area | Awak Mas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Proceeds From Royalty Agreement | $ 100 |  |
PT Masmindo Dwi Area | Awak Mas | First 1,250,000 Ounces Produced |  |  |
Property, Plant and Equipment [Line Items] |  |  |
NSR Royalty Cancellation, Percentage | 1.00% |  |
Remaining NSR Royalty Cancellation, Percentage | 1.00% |  |
PT Masmindo Dwi Area | Awak Mas | Next 1,250,000 Ounces Produced |  |  |
Property, Plant and Equipment [Line Items] |  |  |
NSR Royalty Cancellation, Percentage | 1.25% |  |
Remaining NSR Royalty Cancellation, Percentage | 1.25% |  |
Midas Gold Shares [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Shares owned |  | 6,882,115 | 7,802,615
Nusantara Resources |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Stock Received During Period, Shares, Consideration |  | 666,667 |
Shares owned |  | 1,333,334 |
Nusantara Resources | PT Masmindo Dwi Area | Awak Mas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Stock Received During Period, Shares, Consideration | 666,667 |  |
Stock Received During Period, Value, Consideration | $ 136 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-20 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 6 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-20 | PT Masmindo Dwi Area | Awak Mas | First 1,250,000 Ounces Produced |  |  |
Property, Plant and Equipment [Line Items] |  |  |
NSR Cancellation Proceeds | $ 2,400 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-30 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 1 year |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-30 | PT Masmindo Dwi Area | Awak Mas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
NSR Cancellation Proceeds | $ 2,500 |  |

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