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Accrued Expenses and Other Current Liabilities -Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accrued Liabilities And Other Liabilities [Abstract] |  |
Vehicle payable | $ 25,086 | $ 8,904
Other | 5,189 | 2,668
Total other current liabilities | $ 30,275 | $ 11,572

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