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Land, Property and Equipment | 6 Months Ended
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Jun. 30, 2026
Property, Plant and Equipment [Abstract] |
Land, Property and Equipment | Note 10—Land, Property and Equipment Land, property and equipment, net as of December 31, 2025 and June 30, 2026 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, | ​ ​ ​ | June 30,
​ | ​ ​ ​ | 2025 | ​ ​ ​ | 2026
Land | ​ | $ | 20,536 | ​ | $ | 20,463
LNG liquefaction plants | ​ |  | 96,885 | ​ |  | 96,906
Station equipment | ​ |  | 409,877 | ​ |  | 408,730
Trailers | ​ |  | 71,385 | ​ |  | 71,538
Other equipment | ​ |  | 108,581 | ​ |  | 74,429
RNG production facility | ​ | ​ | 72,808 | ​ | ​ | 72,034
Construction in progress | ​ |  | 38,250 | ​ |  | 43,321
​ | ​ |  | 818,322 | ​ |  | 787,421
Less accumulated depreciation | ​ |  | (494,282) | ​ |  | (474,279)
Total land, property and equipment, net | ​ | $ | 324,040 | ​ | $ | 313,142
​ Included in “Land, property and equipment, net” are capitalized software costs of $40.4 million and $13.9 million as of December 31, 2025 and June 30, 2026, respectively. Accumulated amortization of the capitalized software costs are $37.6 million and $11.2 million as of December 31, 2025 and June 30, 2026, respectively. During the three and six months ended June 30, 2026, the Company wrote-off certain fully depreciated computer hardware and capitalized software that are no longer in use. The Company recorded amortization expense related to capitalized software costs of $0.4 million in the three months ended June 30, 2025 and 2026, and $0.9 million and $0.8 million in the six months ended June 30, 2025 and 2026, respectively. As of December 31, 2025 and June 30, 2026, $2.1 million and $1.4 million, respectively, are included in “Accounts payable” and “Accrued liabilities” in the accompanying condensed consolidated balance sheets, representing amounts related to purchases of property and equipment. These amounts are excluded from the accompanying condensed consolidated statements of cash flows as they are non-cash investing activities. Fueling Station Equipment Removal On January 20, 2025, the Company received notice from Pilot Travel Centers, LLC (“Pilot”) of non-renewal of the Liquified Natural Gas Fueling Station and LNG Master Sales Agreement, dated August 2, 2010, which expired August 1, 2025, in accordance with the agreement. ​ In March 2025, the Company made the decision to allow the agreement to expire, and to remove the station equipment and site improvements from each of the sites. ​ In connection with the decision to remove the station equipment and site improvements, the Company recognized $50.7 million associated with accelerated depreciation expense and incremental Asset Retirement Obligation charges, which are included in “Depreciation and amortization” in the accompanying condensed consolidated statements of operations for the six months ended June 30, 2025.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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