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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Schedule of information by level for assets and liabilities that are measured at fair value on a recurring basis | The following tables provide information by level for assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2024 and September 30, 2025 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities(1) | ​ | $ | 127,429 | ​ | $ | 127,429 | ​ | $ | — | ​ | $ | —
Convertible promissory notes(3) | ​ |  | 2,372 | ​ |  | — | ​ |  | — | ​ |  | 2,372
Certificates of deposit(1) | ​ |  | 541 | ​ |  | — | ​ |  | 541 | ​ |  | —
Embedded derivatives(2) | ​ | ​ | 2,621 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,621
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2025 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities(1) | ​ | $ | 50,767 | ​ | $ | 50,767 | ​ | $ | — | ​ | $ | —
Convertible promissory notes(3) | ​ | ​ | 524 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 524
Certificates of deposit(1) | ​ | ​ | 552 | ​ | ​ | — | ​ | ​ | 552 | ​ | ​ | —
Embedded derivatives(2) | ​ | $ | 1,201 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,201
(1) | Included in “Short-term investments” in the accompanying condensed consolidated balance sheets. See note 5 for more information.
(2) | Included in “Notes receivable and other long-term assets, net” as of December 31, 2024 and September 30, 2025 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.
(3) | Included in “Notes receivable – related party” as of December 31, 2024 and September 30, 2025 in the accompanying condensed consolidated balance sheets.
Schedule of reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis that used significant unobservable inputs (Level 3) | The following table provides a reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis as shown in the tables above that used significant unobservable inputs (Level 3), as well as the change in unrealized gains or losses for the periods included in earnings or other comprehensive income (loss) (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets: | ​ | Assets: | ​ | Liabilities:
​ | ​ | Embedded | ​ | Convertible | ​ | Commodity
​ |  | Derivatives | ​ | Promissory Note | ​ | Swap Contracts
Balance as of June 30, 2024 | ​ | $ | 4,436 | ​ | $ | 5,460 | ​ | $ | —
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total (loss) gain | ​ | ​ | (1,416) | ​ | ​ | 198 | ​ | ​ | —
Purchases | ​ | ​ | — | ​ | ​ | 2,212 | ​ | ​ | —
Equity method investment loss(1) | ​ | ​ | — | ​ | ​ | (1,850) | ​ | ​ | —
Balance as of September 30, 2024 | ​ | $ | 3,020 | ​ | $ | 6,020 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of June 30, 2025 | ​ | $ | 1,520 | ​ | $ | 2,809 | ​ | $ | —
Settlements, net | ​ | ​ | — | ​ | ​ | (2,210) | ​ | ​ | —
Total (loss) gain | ​ | ​ | (319) | ​ | ​ | 3 | ​ | ​ | —
Purchases | ​ | ​ | — | ​ | ​ | 1,009 | ​ | ​ | —
Equity method investment loss(1) | ​ | ​ | — | ​ | ​ | (1,087) | ​ | ​ | —
Balance as of September 30, 2025 | ​ | $ | 1,201 | ​ | $ | 524 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in unrealized (loss) for the three months ended September 30, 2024 included in earnings | ​ | $ | (1,416) | ​ | $ | — | ​ | $ | —
Change in unrealized (loss) gain for the three months ended September 30, 2025 included in earnings | ​ | $ | (319) | ​ | $ | 313 | ​ | $ | —
Change in unrealized (loss) gain for the three months ended September 30, 2024 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | 198 | ​ | $ | —
Change in unrealized gain for the three months ended September 30, 2025 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | 3 | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets: | ​ | Assets: | ​ | Liabilities:
​ | ​ | Embedded | ​ | Convertible | ​ | Commodity
​ |  | Derivatives | ​ | Promissory Notes | ​ | Swap Contracts
Balance as of December 31, 2023 | ​ | $ | 4,628 | ​ | $ | 2,330 | ​ | $ | (1,875)
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,366
Total (loss) gain | ​ | ​ | (1,608) | ​ | ​ | 145 | ​ | ​ | (491)
Purchases | ​ | ​ | — | ​ | ​ | 7,939 | ​ | ​ | —
Equity method investment loss(1) | ​ | ​ | — | ​ | ​ | (4,394) | ​ | ​ | —
Balance as of September 30, 2024 | ​ | $ | 3,020 | ​ | $ | 6,020 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2024 | ​ | $ | 2,621 | ​ | $ | 2,372 | ​ | $ | —
Settlements, net | ​ | ​ | — | ​ | ​ | (2,210) | ​ | ​ | —
Total (loss) gain | ​ | ​ | (1,420) | ​ | ​ | 111 | ​ | ​ | —
Purchases | ​ | ​ | — | ​ | ​ | 3,946 | ​ | ​ | —
Equity method investment loss(1) | ​ | ​ | — | ​ | ​ | (3,695) | ​ | ​ | —
Balance as of September 30, 2025 | ​ | $ | 1,201 | ​ | $ | 524 | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in unrealized (loss) gain for the nine months ended September 30, 2024 included in earnings | ​ | $ | (1,608) | ​ | $ | — | ​ | $ | 1,875
Change in unrealized (loss) gain for the nine months ended September 30, 2025 included in earnings | ​ | $ | (1,420) | ​ | $ | 313 | ​ | $ | —
Change in unrealized gain for the nine months ended September 30, 2024 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | 145 | ​ | $ | —
Change in unrealized gain for the nine months ended September 30, 2025 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | 111 | ​ | $ | —
​
(1) | Represents the Company’s proportionate share of Rimere’s losses. These losses are recorded as adjustments to the carrying value of the convertible promissory notes because the Company’s equity investment in Rimere had been reduced to zero.
Schedule of Debt Instruments at Fair Value | Debt instruments as of December 31, 2024 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Carrying | ​ | Estimated
​ |  | Amounts | ​ | Fair Value
Stonepeak Term Loan | ​ | $ | 265,173 | ​ | $ | 260,123
Other Debt | ​ | ​ | 194 | ​ | ​ | 194
Total Debt | ​ | $ | 265,367 | ​ | $ | 260,317
​ Debt instruments as of September 30, 2025 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Carrying | ​ | Estimated
​ |  | Amounts | ​ | Fair Value
Stonepeak Term Loan | ​ | $ | 284,122 | ​ | $ | 276,722
Other Debt | ​ | ​ | 171 | ​ | ​ | 171
Total Debt | ​ | $ | 284,293 | ​ | $ | 276,893
Embedded derivatives |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Schedule of fair value inputs | The Company estimated the fair value of embedded derivatives in its fueling agreements under the Company’s truck financing program based on the following inputs as of December 31, 2024 and September 30, 2025: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024 | ​ | September 30, 2025
Significant Unobservable Inputs |  | Input Range |  | Weighted Average |  | Input Range |  | Weighted Average
ULSD Gulf Coast Forward Curve | ​ | $2.06 - $2.14 | ​ | $ | 2.10 | ​ | $ 2.09 - $ 2.16 | ​ | $ | 2.12
Historical Differential to PADD 3 Diesel | ​ | $0.73 - $1.62 | ​ | $ | 1.18 | ​ | $ .73 - $ 1.62 | ​ | $ | 1.15
Historical Differential to PADD 5 Diesel | ​ | $2.16 - $3.16 | ​ | $ | 2.59 | ​ | $ 2.28 - $ 3.16 | ​ | $ | 2.59
Convertible promissory notes |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Schedule of fair value inputs | The following table provides quantitative information about the significant inputs used to estimate the fair value of the convertible promissory notes from Rimere as of December 31, 2024 and September 30, 2025:
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
Significant Unobservable Inputs |  | December 31, 2024 |  | September 30, 2025
Risk-free interest rate | ​ | 4.24% | ​ | 4.02%
Credit adjustment | ​ | 4.64% | ​ | 4.86%
Credit adjusted discount rate | ​ | 8.88% | ​ | 8.88%
​ The following table provides quantitative information about the significant inputs used to estimate the fair value of the convertible promissory note from BTR as of December 31, 2024 and September 30, 2025:
​ | ​ | ​ | ​ | ​
Significant Unobservable Inputs |  | December 31, 2024 |  | September 30, 2025
Risk-free interest rate | ​ | 4.31% | ​ | -
Credit adjustment | ​ | 8.64% | ​ | -
Credit adjusted discount rate | ​ | 12.95% | ​ | -

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477734/942-470-50-3 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-8 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-6 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-7 + Details
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