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Alternative Fuel Excise Tax Credit (Details) | Jan. 01, 2022 $ / gal
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Volumetric Excise Tax Credit Disclosure [Abstract] |
Federal alternative fuels tax credit - CNG (in dollars per gasoline gallon equivalent) | 0.50
Federal alternative fuels tax credit - LNG (in dollars per liquid gallon) | 0.50

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- 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_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
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- 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
Period Type: | duration