XML 51 R41.htm IDEA: XBRL DOCUMENT
v3.26.1

Fair Value Measurements (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2026
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, 2025 and June 30, 2026 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, 2025 | ​ ​ ​ | Level 1 | ​ ​ ​ | Level 2 | ​ ​ ​ | Level 3
Assets: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Available-for-sale securities: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
U.S. government securities(1) | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Certificates of deposit(1) | ​ |  | 552 | ​ |  | — | ​ | ​ | 552 | ​ | ​ | —
Embedded derivatives(2) | ​ | ​ | 957 | ​ |  | — | ​ |  | — | ​ |  | 957
Investment tax credit | ​ | ​ | 16,564 | ​ | ​ | — | ​ |  | — | ​ |  | 16,564
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | June 30, 2026 | ​ ​ ​ | Level 1 | ​ ​ ​ | Level 2 | ​ ​ ​ | Level 3
Assets: |  | ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Available-for-sale securities: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
U.S. government securities(1) | ​ | $ | 80,434 | ​ | $ | 80,434 | ​ | $ | — | ​ | $ | —
Certificates of deposit(1) | ​ | ​ | 563 | ​ | ​ | — | ​ | ​ | 563 | ​ | ​ | —
Embedded derivatives(2) | ​ |  | 1,326 | ​ |  | — | ​ |  | — | ​ |  | 1,326
Investment tax credit | ​ | $ | 16,564 | ​ |  | — | ​ |  | — | ​ |  | 16,564
(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, 2025 and June 30, 2026 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.
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: | ​
​ | ​ | Embedded | ​ | Convertible | ​
​ | ​ ​ ​ | Derivatives | ​ | Promissory Note | ​
Balance as of March 31, 2025 | ​ | $ | 2,065 | ​ | $ | 2,638 | ​
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​
Total (loss) gain | ​ | ​ | (545) | ​ | ​ | 42 | ​
Additions | ​ | ​ | — | ​ | ​ | 1,185 | ​
Equity method investment loss | ​ | ​ | — | ​ | ​ | (1,056) | ​
Balance as of June 30, 2025 | ​ | $ | 1,520 | ​ | $ | 2,809 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of March 31, 2026 | ​ | $ | 1,575 | ​ | $ | — | ​
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​
Total (loss) | ​ | ​ | (249) | ​ | ​ | — | ​
Additions | ​ | ​ | — | ​ | ​ | — | ​
Equity method investment loss | ​ | ​ | — | ​ | ​ | — | ​
Balance as of June 30, 2026 | ​ | $ | 1,326 | ​ | $ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in unrealized (loss) for the three months ended June 30, 2025 included in earnings | ​ | $ | (545) | ​ | $ | — | ​
Change in unrealized (loss) for the three months ended June 30, 2026 included in earnings | ​ | $ | (249) | ​ | $ | — | ​
Change in unrealized gain for the three months ended June 30, 2025 included in other comprehensive income gain | ​ | $ | — | ​ | $ | 42 | ​
Change in unrealized gain for the three months ended June 30, 2026 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | — | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets: | ​ | Assets: | ​
​ | ​ | Embedded | ​ | Convertible | ​
​ | ​ ​ ​ | Derivatives | ​ | Promissory Notes | ​
Balance as of December 31, 2024 | ​ | $ | 2,621 | ​ | $ | 2,372 | ​
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​
Total (loss) gain | ​ | ​ | (1,101) | ​ | ​ | 108 | ​
Additions | ​ | ​ | — | ​ | ​ | 2,936 | ​
Equity method investment loss | ​ | ​ | — | ​ | ​ | (2,607) | ​
Balance as of June 30, 2025 | ​ | $ | 1,520 | ​ | $ | 2,809 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2025 | ​ | $ | 957 | ​ | $ | — | ​
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​
Total gain | ​ | ​ | 369 | ​ | ​ | — | ​
Additions | ​ | ​ | — | ​ | ​ | — | ​
Equity method investment loss | ​ | ​ | — | ​ | ​ | — | ​
Balance as of June 30, 2026 | ​ | $ | 1,326 | ​ | $ | — | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in unrealized (loss) for the six months ended June 30, 2025 included in earnings | ​ | $ | (1,101) | ​ | $ | — | ​
Change in unrealized gain for the six months ended June 30, 2026 included in earnings | ​ | $ | 369 | ​ | $ | — | ​
Change in unrealized gain for the six months ended June 30, 2025 included in other comprehensive income gain | ​ | $ | — | ​ | $ | 108 | ​
Change in unrealized gain for the six months ended June 30, 2026 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | — | ​
​
Schedule of Debt Instruments at Fair Value | Debt instruments as of December 31, 2025 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Carrying | ​ | Estimated
​ | ​ ​ ​ | Amounts | ​ | Fair Value
Stonepeak Term Loan | ​ | $ | 226,621 | ​ | $ | 208,348
Other debt | ​ | ​ | 158 | ​ | ​ | 158
Total debt | ​ | $ | 226,779 | ​ | $ | 208,506
​ Debt instruments as of June 30, 2026 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Carrying | ​ | Estimated
​ | ​ ​ ​ | Amounts | ​ | Fair Value
Stonepeak Term Loan | ​ | $ | 228,891 | ​ | $ | 229,599
Other debt | ​ | ​ | 133 | ​ | ​ | 133
Total debt | ​ | $ | 229,024 | ​ | $ | 229,732
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, 2025 and June 30, 2026: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2025 | ​ | June 30, 2026
Significant Unobservable Inputs | ​ ​ ​ | Input Range | ​ ​ ​ | Weighted Average | ​ ​ ​ | Input Range | ​ ​ ​ | Weighted Average
ULSD Gulf Coast Forward Curve | ​ | $2.09 - $2.16 | ​ | $ | 2.12 | ​ | $ 2.55 - $ 2.61 | ​ | $ | 2.57
Historical Differential to PADD 3 Diesel | ​ | $0.73 - $1.62 | ​ | $ | 1.15 | ​ | $ 2.28 - $ 3.53 | ​ | $ | 2.63
Historical Differential to PADD 5 Diesel | ​ | $2.28 - $3.16 | ​ | $ | 2.59 | ​ | - | ​ | $ | -

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -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 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfDebtInstrumentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |