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Mineral Properties - Awak Mas (Details)
$ in Thousands
 12 Months Ended
May 05, 2020
USD ($)
Nov. 01, 2019
USD ($)
oz
Dec. 31, 2020
USD ($)
May 04, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]          
Disposal Group, Deferred Gain on Disposal         $ 2,960
Gain (Loss) On Disposal Of Mineral Property Interests, Net     $ 6,108    
PT Masmindo Dwi Area | Awak Mas          
Property, Plant and Equipment [Line Items]          
NSR Cancellation Proceeds $ 2,400        
Disposal Group, Deferred Gain on Disposal     $ 68 $ 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]          
Remaining NSR Royalty Cancellation, Percentage   1.00%      
Net Smelter Return Royalty Agreement Benchmark | oz   1,250,000      
NSR Royalty Cancelled Percentage 1.00% 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]: 2020-04-20 | 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