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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2024
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ | ​ | 2023 |  | 2024 |  | 2023 |  | 2024
Product revenue: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Volume-related | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fuel sales(1) (3) | ​ | $ | 53,267 | ​ | $ | 57,398 | ​ | $ | 160,162 | ​ | $ | 125,601
Change in fair value of derivative instruments(2) | ​ | ​ | 3,600 | ​ | ​ | 61 | ​ | ​ | 1,068 | ​ | ​ | 1,683
RIN Credits | ​ | ​ | 5,377 | ​ | ​ | 9,523 | ​ | ​ | 9,880 | ​ | ​ | 18,335
LCFS Credits | ​ | ​ | 2,474 | ​ | ​ | 4,319 | ​ | ​ | 4,772 | ​ | ​ | 4,155
AFTC (4) | ​ |  | 5,059 | ​ |  | 6,003 | ​ |  | 9,555 | ​ |  | 11,360
Total volume-related product revenue | ​ | ​ | 69,777 | ​ | ​ | 77,304 | ​ | ​ | 185,437 | ​ | ​ | 161,134
Station construction sales | ​ | ​ | 5,852 | ​ | ​ | 5,656 | ​ | ​ | 9,919 | ​ | ​ | 11,240
Total product revenue | ​ |  | 75,629 | ​ |  | 82,960 | ​ |  | 195,356 | ​ |  | 172,374
Service revenue: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Volume-related, O&M services | ​ | ​ | 13,913 | ​ | ​ | 14,422 | ​ | ​ | 25,957 | ​ | ​ | 28,157
Other services | ​ | ​ | 1,006 | ​ | ​ | 572 | ​ | ​ | 1,418 | ​ | ​ | 1,132
Total service revenue | ​ | ​ | 14,919 | ​ | ​ | 14,994 | ​ | ​ | 27,375 | ​ | ​ | 29,289
Total revenue | ​ | $ | 90,548 | ​ | $ | 97,954 | ​ | $ | 222,731 | ​ | $ | 201,663
(1) | Includes non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant. For the three and six months ended June 30, 2023, contra-revenue charges recognized in fuel revenue were $13.9 million and $27.7 million, respectively. For the three and six months ended June 30, 2024, contra-revenue charges recognized in fuel revenue were $14.1 million and $27.0 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) | Includes net settlement of the Company’s commodity swap derivative instruments. For the three and six months ended June 30, 2023, net settlement payments recognized in fuel revenue were $1.4 million and $1.0 million, respectively. For the three and six months ended June 30, 2024, net settlement payments recognized in fuel revenue were $0.9 million and $2.4 million, respectively.
(4) | Represents the federal alternative fuel excise tax credit (“AFTC”). See Note 19 for more information.
Summary of contract balances | As of December 31, 2023 and June 30, 2024, the Company’s contract balances were as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | June 30,
​ | ​ | 2023 | ​ | 2024
Accounts receivable, net | ​ | $ | 98,426 | ​ | $ | 92,108
​ | ​ | ​ | ​ |  | ​ | ​
Contract assets - current | ​ | $ | 7,823 | ​ | $ | 6,317
Contract assets - non-current | ​ |  | 2,433 | ​ |  | 2,174
Contract assets - total | ​ | $ | 10,256 | ​ | $ | 8,491
​ | ​ | ​ | ​ |  | ​ | ​
Contract liabilities - current | ​ | $ | 4,936 | ​ | $ | 7,794
Contract liabilities - non-current | ​ |  | 151 | ​ |  | 113
Contract liabilities - total | ​ | $ | 5,087 | ​ | $ | 7,907

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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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