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Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2025

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

​

​	​	​	​	​	​	​	​
​	​	Three Months Ended					​
​	​	March 31,					​
​	​	2024			2025
Product revenue:	​	​	​	​	​	​	​
Volume-related	​	​	​	​	​	​	​
Fuel sales(1)	​	$	68,203	​	$	76,292	​
Change in fair value of derivative instruments(2)	​	​	1,622	​	​	(557)	​
RIN Credits	​	​	8,812	​	​	5,202	​
LCFS Credits	​	​	(164)	​	​	3,799	​
AFTC (3)	​		5,357	​		(17)	​
Total volume-related product revenue	​	​	83,830	​	​	84,719	​
Station construction sales	​	​	5,584	​	​	5,571	​
Total product revenue	​		89,414	​		90,290	​
Service revenue:	​	​	​	​	​	​	​
Volume-related, O&M services	​	​	13,735	​	​	12,790	​
Other services	​	​	560	​	​	684	​
Total service revenue	​	​	14,295	​	​	13,474	​
Total revenue	​	$	103,709	​	$	103,764	​

(1) Includes non-cash stock-based sales incentive contra-revenue charges associated with the Amazon Warrant. For the three months ended March 31, 2024, contra-revenue charges recognized in fuel revenue were $12.9 million. For the three months ended March 31, 2025, contra-revenue charges recognized in fuel revenue were $17.3 million. 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 March 31, 2025, the Company’s contract balances were as follows (in thousands):

​	​	​	​	​	​	​
​		December 31,			March 31,
​	​	2024		​	2025
Accounts receivable, net	​	$	107,683	​	$	91,415
​	​	​	​		​	​
Contract assets - current	​	$	2,987	​	$	2,843
Contract assets - non-current	​		1,945	​		1,846
Contract assets - total	​	$	4,932	​	$	4,689
​	​	​	​		​	​
Contract liabilities - current	​	$	6,870	​	$	7,823
Contract liabilities - non-current	​		76	​		57
Contract liabilities - total	​	$	6,946	​	$	7,880

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

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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

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