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Mineral Properties - Awak Mas (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 05, 2020 USD ($) | Nov. 01, 2019 USD ($) oz | Apr. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | May 04, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) On Disposal Of Mineral Property Interests, Net |  |  |  | $ 2,100 | $ 2,568 | $ 2,100 | $ 2,568 |
PT Masmindo Dwi Area | Awak Mas |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
NSR Cancellation Proceeds | $ 2,400 |  |  |  |  |  |  |
Disposal Group, Deferred Gain on Disposal |  |  |  | $ 180 |  | $ 180 |  | $ 168
Gain (Loss) On Disposal Of Mineral Property Interests, Net | $ 2,568 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Net Smelter Return Royalty Agreement Benchmark | oz |  | 1,250,000 |  |  |  |  |  |
NSR Royalty Cancelled 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% |  |  |  |  |  |  |
Net Smelter Return Royalty Agreement Benchmark | oz |  | 1,250,000 |  |  |  |  |  |
NSR Royalty Cancelled Percentage | 1.25% |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-30 | PT Masmindo Dwi Area | Awak Mas | First 1,250,000 Ounces Produced |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
NSR Cancellation Receivable |  | $ 2,400 |  |  |  |  |  |
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 |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-31 | PT Masmindo Dwi Area | Awak Mas |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
NSR Cancellation Proceeds |  |  | $ 2,500 |  |  |  |  |

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