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Supplemental Financial Information
 9 Months Ended
Sep. 30, 2024
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)September 30, 2024December 31, 2023
Prepaid expenses and other current assets:
Prepaid expenses$1,317 $2,430 
Prepaid income taxes and income tax refunds192 349 
Other2,021 2,436 
Total prepaid expenses and other current assets$3,530 $5,215 
Other long-term assets, net:
Spare parts, net$10,753 $9,147 
Right of use assets, operating leases, net9,331 10,592 
Intangible assets, net7,644 7,899 
Mine development costs, net7,125 7,377 
Upfront Customer Consideration (1)
5,586 5,967 
Mine reclamation asset, net1,856 1,955 
Other 2,546 2,663 
Total other long-term assets, net$44,841 $45,600 
(1) Represents remaining balance on consideration paid to a customer under a 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 September 30, 2024 and December 31, 2023, 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)September 30, 2024December 31, 2023
Other current liabilities:
Current portion of operating lease obligations$1,991 $1,944 
Sales, use and other taxes payable1,719 948 
Current portion of asset retirement obligations1,259 182 
Other(1)
2,702 2,718 
Total other current liabilities$7,671 $5,792 
Other long-term liabilities:
Operating lease obligations, long-term$7,569 $8,870 
Asset retirement obligations5,335 5,981 
Other1,125 929 
Total other long-term liabilities$14,029 $15,780 
(1) Included in Other current liabilities as of September 30, 2024 and December 31, 2023 is $1.7 million for the Tinuum Group Obligation as discussed in Note 7.
As of September 30, 2024 and December 31, 2023, 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)September 30, 2024December 31, 2023
Asset retirement obligations, beginning of period$6,163 $8,533 
Asset retirement obligations assumed(1)
— 1,500 
Accretion496 582 
Liabilities settled(2)
(65)(4,866)
Changes due to scope and timing of reclamation— 414 
Asset retirement obligations, end of period6,594 6,163 
Less current portion1,259 182 
Asset retirement obligations, long-term$5,335 $5,981 
(1)     Represents the Corbin ARO and Mine 4 ARO in the amounts of $0.5 million and $1.0 million, respectively, assumed during the period ended December 31, 2023.
(2)     Included in liabilities settled during the period ended December 31, 2023 is $4.7 million related to the removal of the ARO associated with Marshall Mine, LLC as a result of the sale of Marshall Mine, LLC in March 2023.
Supplemental Income Statement Information
Tinuum Group, LLC
As of September 30, 2024 and December 31, 2023, the Company's ownership interest in Tinuum Group, an equity method investment, was 42.5%. For the three and nine months ended September 30, 2024, the Company recognized earnings from Tinuum Group of $0.1 million. For the three and nine months ended September 30, 2023, the Company recognized earnings from Tinuum Group of $0.2 million and $1.1 million, respectively. In 2024, Tinuum Group, LLC has continued to wind down its operations.
For the three and nine months ended September 30, 2024, the Company recognized expense of $0.2 million and $0.7 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. For the three and nine months ended September 30, 2023, the Company recognized expense of $0.2 million and $0.6 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.