Debt Instrument, Number Of Monthly Installments

No definition available.

Name:	clne_DebtInstrumentNumberOfMonthlyInstallments
Namespace Prefix:	clne_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of the monthly rental payments due under the lease agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	clne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash inflow received by a seller-lessee in a sale-leaseback.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Sale Leaseback Transaction, Number Of Monthly Installments

+ References

No definition available.

+ Details

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Namespace Prefix:	clne_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Sale Leaseback Transaction, Purchase Price

+ References

No definition available.

+ Details

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Namespace Prefix:	clne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Sale Leaseback Transaction, Term

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

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

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=clne_SaleLeasebackTransactionNationsFundILlcMasterLeaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Period Type:

- Details

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Debt - NG Advantage Debt and Financing Lease Obligations (Details) $ in Thousands						12 Months Ended
	Feb. 01, 2021 USD ($)	Dec. 10, 2020 USD ($)	Dec. 20, 2018 USD ($)	Mar. 01, 2018 USD ($) installment	Dec. 18, 2017 USD ($) installment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2016 USD ($) installment
Long-term debt [Line Items]
Loss on extinguishment of debt						$ 39	$ 1,249
Proceeds from revolving line of credit						1,450
Repayments of borrowing under revolving line of credit						1,450
Compression Station
Long-term debt [Line Items]
Purchase price			$ 7,000
Sale leaseback transaction, term			5 years
Annual rate (as a percent)			12.00%
Monthly rental payments			$ 100
BoA \| BoA MLA
Long-term debt [Line Items]
Proceeds from sale of equipment in sale-leaseback agreement					$ 2,100
Sale leaseback transaction, term					5 years
Number of equal monthly installments \| installment					60
Annual rate (as a percent)					4.86%
First National \| First National MLA
Long-term debt [Line Items]
Proceeds from sale of equipment in sale-leaseback agreement				$ 6,300
Sale leaseback transaction, term				6 years
Number of equal monthly installments \| installment				72
First National \| Nations MLA
Long-term debt [Line Items]
Annual rate (as a percent)				9.28%
NG Advantage debt \| Long-term portion of restricted cash \| Berkshire Bank
Long-term debt [Line Items]
Loan pledged as collateral						7,000
NG Advantage debt \| 5% maturing on January 1, 2026 \| Berkshire Bank
Long-term debt [Line Items]
Debt issuance amount	$ 14,500
Interest rate	5.00%
Period during which the debt instrument principal balance is required to be paid following its issuance	5 years
NG Advantage debt \| Revolving line of credit \| Berkshire Bank
Long-term debt [Line Items]
Maximum borrowing capacity (up to)		$ 1,000
Outstanding line of credit						$ 0
Interest rate during period (as a percent)		3.00%
NG Advantage debt \| Revolving line of credit \| Berkshire Bank \| Prime Rate
Long-term debt [Line Items]
Basis spread on variable rate		0.25%
NG Advantage debt \| 5.17% Term Loan \| Wintrust Commercial Finance
Long-term debt [Line Items]
Debt issuance amount								$ 4,700
Number of monthly installments \| installment								72
Interest rate								5.17%