v3.26.1
Supplemental Financial Information - Schedule of Other Long Term Assets (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Dec. 31, 2024
Mar. 31, 2026
Dec. 31, 2025
Prepaid expenses and other current assets:      
Prepaid expenses   $ 2,105 $ 2,959
Prepaid lender fees, net   1,520 1,472
Prepaid taxes and tax refunds   141 147
Other   1,747 1,826
Total prepaid expenses and other current assets   5,513 6,404
Other long-term assets, net:      
Spare parts, net   10,755 11,017
Mine development costs, net   6,701 6,763
Right of use assets, operating leases, net   6,108 6,793
Upfront Customer Consideration   5,459 5,639
Mine reclamation asset, net   1,613 1,645
Intangible assets, net   585 570
Other   $ 2,619 $ 2,680
Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration]   Total other long-term assets, net Total other long-term assets, net
Total other long-term assets, net   $ 33,840 $ 35,107
Term of contract   15 years  
Revolving Credit Facility | Secured Debt      
Other long-term assets, net:      
Contractual period 5 years 5 years