v3.26.1
Supplemental Financial Information
 3 Months Ended
Mar. 31, 2026
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Supplemental Financial Information Supplemental Financial Information
Supplemental Balance Sheet Information
The following table summarizes the components of Prepaid expenses and other current assets and Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:
As of
(in thousands)March 31, 2026December 31, 2025
Prepaid expenses and other current assets:
Prepaid expenses$2,105 $2,959 
Prepaid lender fees, net (1)
1,520 1,472 
Prepaid taxes and tax refunds141 147 
Other1,747 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, net6,701 6,763 
Right of use assets, operating leases, net6,108 6,793 
Upfront Customer Consideration (2)
5,459 5,639 
Mine reclamation asset, net1,613 1,645 
Intangible assets, net585 570 
Other 2,619 2,680 
Total other long-term assets, net$33,840 $35,107 
(1) Represents legal and administrative costs incurred to obtain the Revolving Credit Facility. This asset is being amortized on a straight-line basis over the five-year contractual period of the Revolving Credit Facility.
(2) Represents remaining balance on consideration paid to a customer under a long-term supply contract executed in 2020. This asset is being amortized as a reduction to revenue on a straight-line basis over the expected 15-year contractual period of the contract.
Spare parts include critical spares required to support plant operations.
Mine development costs include acquisition costs, the cost of other development work and mitigation costs related to the Five Forks Mine and are depleted over the estimated life of the related mine reserves.
Mine reclamation asset, net represents an asset retirement obligation ("ARO") asset related to the Five Forks Mine and is depreciated over its estimated life.
As of March 31, 2026 and December 31, 2025, Other includes the Highview Investment in the amount of $0.6 million that is carried at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the same issuer.
The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets:
 As of
(in thousands)March 31, 2026December 31, 2025
Other current liabilities:
Current portion of operating lease obligations$2,933 $2,842 
Current portion of mine reclamation liability1,037 1,037 
Sales, use and other taxes payable
995 1,304 
Other1,023 1,832 
Total other current liabilities$5,988 $7,015 
Other long-term liabilities:
Mine reclamation liabilities$5,810 $5,719 
Operating lease obligations, long-term5,220 6,086 
Other21 63 
Total other long-term liabilities$11,051 $11,868 
As of March 31, 2026 and December 31, 2025, the ARO related to the Five Forks Mine is included in Other long-term liabilities.
The Mine reclamation liabilities represent AROs. Changes in the AROs were as follows:
As of
(in thousands)March 31, 2026December 31, 2025
Asset retirement obligations, beginning of period$6,756 $6,279 
Accretion139 513 
Liabilities settled(48)(177)
Changes due to scope and timing of reclamation— 141 
Asset retirement obligations, end of period6,847 6,756 
Less current portion1,037 1,037 
Asset retirement obligations, long-term$5,810 $5,719 

Supplemental Income Statement Information
Tinuum Group, LLC
As of March 31, 2026 and December 31, 2025, the Company's ownership interest in Tinuum Group, an equity method investment, was 42.5%. For the three months ended March 31, 2026 and 2025, the Company recognized earnings from Tinuum Group of $0.1 million and $0.2 million, respectively, in Other income. In 2026, Tinuum Group, LLC has continued to wind down its operations.
For the three months ended March 31, 2026, the Company recognized expense of $0.2 million in Cost of revenue, exclusive of depreciation and amortization, related to royalties owed to Tinuum Group under an agreement for certain of the Company's sales of M-ProveTM products.