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Debt - Riverstone Credit Agreement (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Debt Disclosure [Abstract] |  |
Interest expense | $ 7,762 | $ 4,354

X
- Definition Interest Expense, Nonoperating + References No definition available. + Details
Name: | clne_InterestExpenseNonoperating
Namespace Prefix: | clne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration