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Stockholders' Equity - Amazon Warrant Activity (Details) - Amazon Warrant	3 Months Ended
	Mar. 31, 2024 USD ($) shares
Class of Warrant or Right [Line Items]
Outstanding and unvested Beginning Balance | $	$ 37,613,035
Granted	0
Vested	(1,763,112)
Outstanding and unvested as of Ending Balance | $	$ 35,849,923
Number of warrants vested	1,763,112

X

- Definition

Number of warrants granted.

+ References

No definition available.

+ Details

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Namespace Prefix:	clne_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants vested.

+ References

No definition available.

+ Details

Name:	clne_WarrantsVestedNumberOfShares
Namespace Prefix:	clne_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

Name:	us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=clne_AmazonWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: