v3.26.1
Supplemental Financial Information - Schedule of Other Long Term Assets (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended
Dec. 31, 2024
Jun. 30, 2026
Dec. 31, 2025
Prepaid expenses and other current assets:      
Prepaid expenses   $ 3,617 $ 2,959
Prepaid lender fees, net   1,418 1,472
Prepaid taxes and tax refunds   143 147
Other   1,716 1,826
Total prepaid expenses and other current assets   6,894 6,404 [1]
Other long-term assets, net:      
Spare parts, net   11,015 11,017
Mine development costs, net   6,618 6,763
Right of use assets, operating leases, net   5,412 6,793
Upfront Customer Consideration   5,279 5,639
Deferred plant turnaround costs, net   2,369 394
Mine reclamation asset, net   1,581 1,645
Intangible assets, net   $ 572 $ 570
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]   Total other long-term assets, net Total other long-term assets, net
Other   $ 2,654 $ 2,680
Total other long-term assets, net   $ 35,500 $ 35,501 [1]
15-Years Contractual Period      
Other long-term assets, net:      
Term of contract   15 years  
2-Years Contractual Period      
Other long-term assets, net:      
Term of contract   2 years  
Revolving Credit Facility | Secured Debt      
Other long-term assets, net:      
Contractual period 5 years 5 years  
[1] (1) Adjusted to reflect the retrospective change in accounting method for planned major maintenance costs as described in Note 1. See Note 12 for reconciliation to previously reported amounts