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Supplemental Financial Information - Schedule of Change in Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligations, beginning of period $ 8,533 $ 9,959
Asset retirement obligations assumed 1,500 0
Accretion 303 611
Liabilities settled (4,844) (2,071)
Changes due to scope and timing of reclamation 0 34
Asset retirement obligations, end of period 5,492 8,533
Less current portion 169 548
Asset retirement obligations, long-term 5,323 7,985
Business Acquisition [Line Items]    
Asset retirement obligations assumed 1,500 $ 0
Corbin ARO    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligations assumed 500  
Business Acquisition [Line Items]    
Asset retirement obligations assumed 500  
Mine 4 ARO    
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligations assumed 1,000  
Business Acquisition [Line Items]    
Asset retirement obligations assumed $ 1,000