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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2024
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, 2023 and June 30, 2024 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities(1) | ​ | $ | 157,656 | ​ | $ | 157,656 | ​ | $ | — | ​ | $ | —
Convertible promissory notes(4) | ​ |  | 2,330 | ​ |  | — | ​ |  | — | ​ |  | 2,330
Certificates of deposit (1) | ​ |  | 530 | ​ |  | — | ​ |  | 530 | ​ |  | —
Embedded derivatives (3) | ​ | ​ | 4,628 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,628
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​
Commodity swap contracts (2) | ​ | $ | 1,875 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,875
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2024 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. government securities(1) | ​ | $ | 125,671 | ​ | $ | 125,671 | ​ | $ | — | ​ | $ | —
Convertible promissory notes(4) | ​ | ​ | 5,460 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,460
Certificates of deposit (1) | ​ | ​ | 541 | ​ | ​ | — | ​ | ​ | 541 | ​ | ​ | —
Embedded derivatives (3) | ​ | $ | 4,436 | ​ | $ | — | ​ | $ | — | ​ | $ | 4,436
​
(1) | Included in “Short-term investments” in the accompanying condensed consolidated balance sheets. See Note 5 for more information.
(2) | Included in “Derivative liabilities, related party” as of December 31, 2023 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.
(3) | Included in “Prepaid expenses and other current assets” and “Notes receivable and other long-term assets, net” as of December 31, 2023 and June 30, 2024 in the accompanying condensed consolidated balance sheets. See Note 6 for more information.
(4) | Included in “Other receivables” as of December 31, 2023 and June 30, 2024 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: | ​ | Assets: | ​ | Liabilities: | ​ | Liabilities:
​ | ​ | Commodity | ​ | Embedded | ​ | Convertible | ​ | Commodity | ​ | Embedded
​ |  | Swap Contracts |  | Derivatives | ​ | Promissory Note | ​ | Swap Contracts | ​ | Derivatives
Balance as of March 31, 2023 | ​ | $ | — | ​ | $ | 4,949 | ​ | $ | 3,048 | ​ | $ | (3,875) | ​ | $ | (696)
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,441 | ​ | ​ | —
Total gain (loss) | ​ |  | — | ​ | ​ | 1,888 | ​ | ​ | 889 | ​ | ​ | (345) | ​ | ​ | 616
Purchases | ​ |  | — | ​ | ​ | — | ​ | ​ | 1,268 | ​ | ​ | — | ​ | ​ | —
Equity method investment loss(1) | ​ |  | — | ​ | ​ | — | ​ | ​ | (910) | ​ | ​ | — | ​ | ​ | —
Balance as of June 30, 2023 | ​ | $ | — | ​ | $ | 6,837 | ​ | $ | 4,295 | ​ | $ | (2,779) | ​ | $ | (80)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of March 31, 2024 | ​ | $ | — | ​ | $ | 5,252 | ​ | $ | 4,744 | ​ | $ | (877) | ​ | $ | —
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 873 | ​ | ​ | —
Total gain (loss) | ​ |  | — | ​ | ​ | (816) | ​ | ​ | — | ​ | ​ | 4 | ​ | ​ | —
Purchases | ​ |  | — | ​ | ​ | — | ​ | ​ | 2,072 | ​ | ​ | — | ​ | ​ | —
Equity method investment loss(1) | ​ |  | — | ​ | ​ | — | ​ | ​ | (1,356) | ​ | ​ | — | ​ | ​ | —
Balance as of June 30, 2024 | ​ | $ | — | ​ | $ | 4,436 | ​ | $ | 5,460 | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in unrealized gain (loss) for the three months ended June 30, 2023 included in earnings | ​ | $ | — | ​ | $ | 1,888 | ​ | $ | — | ​ | $ | 1,096 | ​ | $ | 616
Change in unrealized gain (loss) for the three months ended June 30, 2024 included in earnings | ​ | $ | — | ​ | $ | (816) | ​ | $ | — | ​ | $ | 877 | ​ | $ | —
Change in unrealized gain (loss) for the three months ended June 30, 2023 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | — | ​ | $ | 889 | ​ | $ | — | ​ | $ | —
Change in unrealized gain (loss) for the three months ended June 30, 2024 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Assets: | ​ | Assets: | ​ | Assets: | ​ | Liabilities: | ​ | Liabilities:
​ | ​ | Commodity | ​ | Embedded | ​ | Convertible | ​ | Commodity | ​ | Embedded
​ |  | Swap Contracts |  | Derivatives | ​ | Promissory Notes | ​ | Swap Contracts | ​ | Derivatives
Balance as of December 31, 2022 | ​ | $ | — | ​ | $ | 6,755 | ​ | $ | 1,880 | ​ | $ | (3,845) | ​ | $ | —
Settlements, net | ​ | ​ | (1,424) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,456 | ​ | ​ | —
Total gain (loss) | ​ |  | 1,424 | ​ | ​ | 82 | ​ | ​ | 1,105 | ​ | ​ | (1,390) | ​ | ​ | (80)
Purchases | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,478 | ​ | ​ | — | ​ | ​ | —
Equity method investment loss(1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,168) | ​ | ​ | — | ​ | ​ | —
Balance as of June 30, 2023 | ​ | $ | — | ​ | $ | 6,837 | ​ | $ | 4,295 | ​ | $ | (2,779) | ​ | $ | (80)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2023 | ​ | $ | — | ​ | $ | 4,628 | ​ | $ | 2,330 | ​ | $ | (1,875) | ​ | $ | —
Settlements, net | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,366 | ​ | ​ | —
Total gain (loss) | ​ |  | — | ​ | ​ | (192) | ​ | ​ | (53) | ​ | ​ | (491) | ​ | ​ | —
Purchases | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,727 | ​ | ​ | — | ​ | ​ | —
Equity method investment loss(1) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,544) | ​ | ​ | — | ​ | ​ | —
Balance as of June 30, 2024 | ​ | $ | — | ​ | $ | 4,436 | ​ | $ | 5,460 | ​ | $ | — | ​ | $ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in unrealized gain (loss) for the six months ended June 30, 2023 included in earnings | ​ | $ | — | ​ | $ | 82 | ​ | $ | — | ​ | $ | 1,066 | ​ | $ | (80)
Change in unrealized gain (loss) for the six months ended June 30, 2024 included in earnings | ​ | $ | — | ​ | $ | (192) | ​ | $ | — | ​ | $ | 1,875 | ​ | $ | —
Change in unrealized gain (loss) for the six months ended June 30, 2023 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | — | ​ | $ | 1,105 | ​ | $ | — | ​ | $ | —
Change in unrealized gain (loss) for the six months ended June 30, 2024 included in other comprehensive income (loss) | ​ | $ | — | ​ | $ | — | ​ | $ | (53) | ​ | $ | — | ​ | $ | —
​
(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, 2023 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Carrying | ​ | Estimated
​ |  | Amounts | ​ | Fair Value
Stonepeak Term Loan | ​ | $ | 260,906 | ​ | $ | 253,303
Other Debt | ​ | ​ | 255 | ​ | ​ | 255
Total Debt | ​ | $ | 261,161 | ​ | $ | 253,558
​ Debt instruments as of June 30, 2024 consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net Carrying | ​ | Estimated
​ |  | Amounts | ​ | Fair Value
Stonepeak Term Loan | ​ | $ | 262,734 | ​ | $ | 243,848
Other Debt | ​ | ​ | 221 | ​ | ​ | 221
Total Debt | ​ | $ | 262,955 | ​ | $ | 244,069
Commodity swaps |
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 its outstanding commodity swap contracts based on the following inputs as of December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
Significant Unobservable Inputs |  | Input Range |  | Weighted Average
ULSD Gulf Coast Forward Curve | ​ | $1.97 - $2.27 | ​ | $ | 2.15
Historical Differential to PADD 3 Diesel | ​ | $0.92 - $1.62 | ​ | $ | 1.16
Historical Differential to PADD 5 Diesel | ​ | $1.89 - $3.16 | ​ | $ | 2.48
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, 2023 and June 30, 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023 | ​ | June 30, 2024
Significant Unobservable Inputs |  | Input Range |  | Weighted Average |  | Input Range |  | Weighted Average
ULSD Gulf Coast Forward Curve | ​ | $1.97 - $2.27 | ​ | $ | 2.15 | ​ | $ 2.25 - $ 2.42 | ​ | $ | 2.34
Historical Differential to PADD 3 Diesel | ​ | $0.92 - $1.62 | ​ | $ | 1.16 | ​ | $ 0.93 - $ 1.62 | ​ | $ | 1.17
Historical Differential to PADD 5 Diesel | ​ | $1.89 - $3.16 | ​ | $ | 2.48 | ​ | $ 1.98 - $ 3.16 | ​ | $ | 2.56
Convertible promissory note |
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, 2023 and June 30, 2024:
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
Significant Unobservable Inputs |  | December 31, 2023 |  | June 30, 2024
Risk-free interest rate | ​ | 5.39% | ​ | 5.33%
Credit adjustment | ​ | 5.31% | ​ | 7.32%
Credit adjusted discount rate | ​ | 10.70% | ​ | 12.65%
​ 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 June 30, 2024:
​ | ​ | ​
Significant Unobservable Inputs |  | June 30, 2024
Risk-free interest rate | ​ | 5.16%
Credit adjustment | ​ | 11.34%
Credit adjusted discount rate | ​ | 16.50%

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