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Supplemental Financial Information
 6 Months Ended
Jun. 30, 2025
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)June 30, 2025December 31, 2024
Prepaid expenses and other current assets:
Prepaid expenses$4,309 $2,021 
Prepaid lender fees, net (1)
1,571 982 
Prepaid income taxes and income tax refunds159 233 
Other1,343 1,414 
Total prepaid expenses and other current assets$7,382 $4,650 
Other long-term assets, net:
Spare parts, net$11,678 $11,178 
Right of use assets, operating leases, net9,516 9,312 
Intangible assets, net7,376 7,569 
Mine development costs, net6,851 7,010 
Upfront Customer Consideration (2)
5,205 5,459 
Mine reclamation asset, net1,562 1,620 
Other 2,601 2,581 
Total other long-term assets, net$44,789 $44,729 
(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 June 30, 2025 and December 31, 2024, 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)June 30, 2025December 31, 2024
Other current liabilities:
Current portion of operating lease obligations$2,560 $2,081 
Sales, use and other taxes payable1,485 2,325 
Current portion of mine reclamation liability1,037 1,037 
Other (1)
5,268 2,741 
Total other current liabilities$10,350 $8,184 
Other long-term liabilities:
Operating lease obligations, long-term$7,186 $7,460 
Mine reclamation liabilities5,413 5,242 
Other265 367 
Total other long-term liabilities$12,864 $13,069 
(1) Included in Other current liabilities as of June 30, 2025 and December 31, 2024 is $1.7 million for the Tinuum Group Obligation as discussed in Note 6.
As of June 30, 2025 and December 31, 2024, 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)June 30, 2025December 31, 2024
Asset retirement obligations, beginning of period$6,279 $6,163 
Accretion254 666 
Liabilities settled(83)(77)
Changes due to scope and timing of reclamation— (473)
Asset retirement obligations, end of period6,450 6,279 
Less current portion1,037 1,037 
Asset retirement obligations, long-term$5,413 $5,242 
Supplemental Income Statement Information
Tinuum Group, LLC
As of June 30, 2025 and December 31, 2024, the Company's ownership interest in Tinuum Group, an equity method investment, was 42.5%. For the three and six months ended June 30, 2025, the Company recognized earnings from Tinuum Group of zero and $0.2 million, respectively. In 2025, Tinuum Group, LLC has continued to wind down its operations.
For the three and six months ended June 30, 2025, 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. For the three and six months ended June 30, 2024, the Company recognized expense of $0.3 million and $0.5 million, respectively, 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.