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Mineral Properties - Awak Mas (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 05, 2020
USD ($)
Nov. 01, 2019
USD ($)
oz
Apr. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
May 04, 2020
USD ($)
Property, Plant and Equipment [Line Items]              
Gain (Loss) On Disposal Of Mineral Property Interests, Net       $ 3,540 $ 2,100 $ 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         $ 315   $ 168
Gain (Loss) On Disposal Of Mineral Property Interests, Net 2,568            
PT Masmindo Dwi Area | Awak Mas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-30              
Property, Plant and Equipment [Line Items]              
NSR Cancellation Proceeds $ 2,500            
PT Masmindo Dwi Area | Awak Mas | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-31              
Property, Plant and Equipment [Line Items]              
NSR Cancellation Proceeds     $ 2,500        
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 | First 1,250,000 Ounces Produced | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-30              
Property, Plant and Equipment [Line Items]              
NSR Cancellation Receivable   $ 2,400          
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%