v3.26.1
Supplemental Financial Information - Schedule of Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Other current liabilities:    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total other current liabilities Total other current liabilities
Current portion of operating lease obligations $ 2,654 $ 2,842
Sales, use and other taxes payable 1,282 1,304
Current portion of mine reclamation liability 1,037 1,037
Other 3,095 1,832
Total other current liabilities 8,068 7,015 [1]
Other long-term liabilities:    
Mine reclamation liabilities $ 5,901 $ 5,719
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Total other long-term liabilities Total other long-term liabilities
Operating lease obligations, long-term $ 4,705 $ 6,086
Other 0 63
Total other long-term liabilities $ 10,606 $ 11,868 [1]
[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