XML 45 R35.htm IDEA: XBRL DOCUMENT
v3.25.3

Revenue from Contracts with Customers (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenue | are subsequently remitted to governmental authorities. The table below presents the Company’s revenue disaggregated by revenue source (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ | ​ | 2024 |  | 2025 |  | 2024 |  | 2025 | ​
Product revenue: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Volume-related | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fuel sales(1) | ​ | $ | 64,116 | ​ | $ | 69,860 | ​ | $ | 189,717 | ​ | $ | 214,035 | ​
Change in fair value of derivative instruments(2) | ​ | ​ | (1,416) | ​ | ​ | (319) | ​ | ​ | 267 | ​ | ​ | (1,420) | ​
RIN Credits | ​ | ​ | 11,066 | ​ | ​ | 8,329 | ​ | ​ | 29,401 | ​ | ​ | 22,729 | ​
LCFS Credits | ​ | ​ | 1,924 | ​ | ​ | 3,148 | ​ | ​ | 6,079 | ​ | ​ | 9,650 | ​
AFTC(3) | ​ |  | 6,390 | ​ |  | — | ​ |  | 17,750 | ​ |  | (28) | ​
Total volume-related product revenue | ​ | ​ | 82,080 | ​ | ​ | 81,018 | ​ | ​ | 243,214 | ​ | ​ | 244,966 | ​
Station construction sales | ​ | ​ | 7,820 | ​ | ​ | 9,877 | ​ | ​ | 19,060 | ​ | ​ | 23,331 | ​
Total product revenue | ​ |  | 89,900 | ​ |  | 90,895 | ​ |  | 262,274 | ​ |  | 268,297 | ​
Service revenue: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
O&M services | ​ | ​ | 14,406 | ​ | ​ | 14,601 | ​ | ​ | 42,563 | ​ | ​ | 42,243 | ​
Other services | ​ | ​ | 570 | ​ | ​ | 641 | ​ | ​ | 1,702 | ​ | ​ | 1,974 | ​
Total service revenue | ​ | ​ | 14,976 | ​ | ​ | 15,242 | ​ | ​ | 44,265 | ​ | ​ | 44,217 | ​
Total revenue | ​ | $ | 104,876 | ​ | $ | 106,137 | ​ | $ | 306,539 | ​ | $ | 312,514 | ​
(1) | Includes non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant. For the three and nine months ended September 30, 2024, contra-revenue charges recognized in fuel revenue were $15.8 million and $42.7 million, respectively. For the three and nine months ended September 30, 2025, contra-revenue charges recognized in fuel revenue were $16.8 million and $51.5 million, respectively. 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.
Schedule of contract balances | As of December 31, 2024 and September 30, 2025, the Company’s contract balances were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | September 30,
​ | ​ | 2024 | ​ | 2025
Accounts receivable, net | ​ | $ | 107,683 | ​ | $ | 96,156
​ | ​ | ​ | ​ |  | ​ | ​
Contract assets - current | ​ | $ | 2,987 | ​ | $ | 5,873
Contract assets - non-current | ​ |  | 1,945 | ​ |  | 1,647
Contract assets - total | ​ | $ | 4,932 | ​ | $ | 7,520
​ | ​ | ​ | ​ |  | ​ | ​
Contract liabilities - current | ​ | $ | 6,870 | ​ | $ | 10,423
Contract liabilities - non-current | ​ |  | 76 | ​ |  | 19
Contract liabilities - total | ​ | $ | 6,946 | ​ | $ | 10,442

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

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

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration