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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net loss attributable to Clean Energy Fuels Corp. $ (20,240) $ (16,293) $ (155,207) $ (34,736)
Weighted-average common shares outstanding 220,393,997 223,289,936 222,024,912 223,250,123
Dilutive effect of potential common shares from restricted stock units, stock options and stock warrants 0 0 0 0
Weighted-average common shares outstanding - diluted 220,393,997 223,289,936 222,024,912 223,250,123
Basic loss per share (in dollars per share) $ (0.09) $ (0.07) $ (0.7) $ (0.16)
Diluted loss per share (in dollars per share) $ (0.09) $ (0.07) $ (0.7) $ (0.16)