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Summary of Significant Accounting Policies - Alternative Fuel Excise Tax Credit (Details) - $ / gal	12 Months Ended		36 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2024
Volumetric Excise Tax Credit Disclosure [Abstract]
Federal alternative fuels tax credit - CNG (in dollars per gasoline gallon equivalent)	0.5	0.5	0.5
Federal alternative fuels tax credit - LNG (in dollars per liquid gallon)	0.5	0.5	0.5

X

- Definition

Represents the volumetric excise tax credit per gasoline gallon equivalent of compressed natural gas (CNG).

+ References

No definition available.

+ Details

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Namespace Prefix:	clne_
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X

- Definition

Represents the volumetric excise tax credit per liquid gallon of liquefied natural gas (LNG).

+ References

No definition available.

+ Details

Name:	clne_AlternativeFuelsExciseTaxCreditLiquefiedNaturalGas
Namespace Prefix:	clne_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	clne_VolumetricExciseTaxCreditDisclosureAbstract
Namespace Prefix:	clne_
Data Type:	xbrli:stringItemType
Balance Type:	na
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