Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Liabilities And Other Liabilities [Abstract]
Accrued marketing expenses	$ 6,488	$ 3,158
Vehicle related expenses	8,234	8,923
Sales taxes	11,304	7,455
Accrued compensation and benefits	2,654	3,386
Accrued professional services	5,537	2,964
Accrued Series H preferred stock issuance costs		5,020
Other	6,681	7,585
Total accrued expenses	$ 40,898	$ 38,491