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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Significant Accounting Policies
Accounts receivable	$ 133,900,000		$ 104,700,000
Allowance for credit loss	14,600,000		$ 15,200,000
Write-offs	0
Sales and marketing	78,620,000	$ 196,437,000
Change in allowance for credit losses	0	0
Driver Passenger and Light Vehicle Renter Incentive Programs
Significant Accounting Policies
Reduction of revenue	196,200,000	112,200,000
Sales and marketing	$ 13,100,000	$ 100,100,000

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Significant accounting policies line items.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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Amount of allowance for credit loss on accounts receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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Amount of increase (decrease) in allowance for credit loss on accounts receivable.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Amount of direct write-downs of accounts receivable charged against the allowance.

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