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- Definition

Aggregate number of common shares reserved for future issuance.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Amount of expense for employee benefit and equity-based compensation.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of common stock reserved (in shares)	49,500,827		49,500,827		49,746,246
Aggregate intrinsic value of employee options exercised			$ 45,941
Compensation cost related to the nonvested awards not yet recognized	$ 18,639		$ 18,639
Weighted average period for recognition of compensation cost			2 years
Employer discretionary contribution amount	179	$ 395	$ 1,640	$ 1,749
Internal-use software and website development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
cumulative stock-based compensation expense	$ 1,719	$ 1,256	$ 5,324	$ 4,486
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percent of the lower of the market price for Purchase shares of common stock			85.00%
Employee stock incentive plan purchase period			6 months
Total shares of common stock reserved (in shares)	4,571,095		4,571,095
Compensation cost related to the nonvested awards not yet recognized	$ 7,419		$ 7,419
Weighted average period for recognition of compensation cost			1 year
2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of common stock reserved (in shares)	11,841,834		11,841,834
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, expiration period			10 years
Vesting period			4 years
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			4 years
Compensation cost related to the nonvested awards not yet recognized	$ 254,070		$ 254,070
Weighted average period for recognition of compensation cost			2 years 8 months 12 days
Restricted Stock Units \| Share-Based Payment Arrangement, Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights percentage			25.00%
Cliff vesting period			1 year
Restricted Stock Units \| Share-Based Payment Arrangement, Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights percentage			6.25%
Restricted Stock Units \| Share-Based Payment Arrangement, Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights percentage			6.25%