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Revenue from Contracts with Customers (Tables) | 3 Months Ended
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Mar. 31, 2026
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | 2025 | ​ ​ ​ | 2026
Product revenue: | ​ | ​ | ​ | ​ | ​ | ​
Volume-related | ​ | ​ | ​ | ​ | ​ | ​
Fuel sales(1) | ​ | $ | 76,292 | ​ | $ | 79,568
Change in fair value of derivative instruments(2) | ​ | ​ | (557) | ​ | ​ | 616
RIN Credits | ​ | ​ | 5,202 | ​ | ​ | 10,122
LCFS Credits | ​ | ​ | 3,799 | ​ | ​ | 4,327
AFTC(3) | ​ |  | (17) | ​ |  | —
Total volume-related product revenue | ​ | ​ | 84,719 | ​ | ​ | 94,633
Station construction sales | ​ | ​ | 5,571 | ​ | ​ | 8,240
Total product revenue | ​ |  | 90,290 | ​ |  | 102,873
Service revenue: | ​ | ​ | ​ | ​ | ​ | ​
O&M services(1) (4) | ​ | ​ | 12,790 | ​ | ​ | 14,212
Other services | ​ | ​ | 684 | ​ | ​ | 471
Total service revenue | ​ | ​ | 13,474 | ​ | ​ | 14,683
Total revenue | ​ | $ | 103,764 | ​ | $ | 117,556
(1) | Includes non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant. For the three months ended March 31, 2025, contra-revenue charges recognized in fuel revenue were $17.3 million. For the three months ended March 31, 2026, contra-revenue charges recognized in fuel sales were $7.5 million and contra-revenue charges recognized in O&M services revenue were $2.6 million for a total of $10.1 million of contra-revenue charges. See Note 14 for more information.
(2) | Represents changes in fair value of unsettled derivative instruments relating to the Company’s commodity swap and customer fueling contracts associated with the Company’s truck financing program. The amounts are classified as revenue because the Company’s commodity swap contracts are used to economically offset the risk associated with the diesel-to-natural gas price spread resulting from customer fueling contracts under the Company’s truck financing program. See Note 6 for more information about these derivative instruments.
(3) | Represents the federal alternative fuel excise tax credit (“AFTC”). AFTC was available for vehicle fuel sales made through December 31, 2024, at which time the program expired.
(4) | This amount includes $2.8 million of facility use fee, which was determined to be lease income under ASC 842 (refer to Note 18 – Leases).
Schedule of contract balances | As of December 31, 2025 and March 31, 2026, the Company’s contract balances were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ | ​ ​ | December 31, | ​ ​ | March 31,
​ | ​ | ​ | 2025 | ​ | 2026
Accounts receivable, net | ​ | ​ | $ | 100,793 | ​ | $ | 110,566
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contract assets - current | ​ | ​ | $ | 3,946 | ​ | $ | 3,551
Contract assets - non-current | ​ | ​ |  | 1,548 | ​ |  | 1,448
Contract assets - total | ​ | ​ | $ | 5,494 | ​ | $ | 4,999
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contract liabilities - current | ​ | ​ | $ | 17,595 | ​ | $ | 14,721
Contract liabilities - non-current | ​ | ​ |  | — | ​ |  | —
Contract liabilities - total | ​ | ​ | $ | 17,595 | ​ | $ | 14,721

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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