Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Redeemable Convertible Preferred Stock - Summary of Redeemable Convertible Preferred Stock (Details) - USD ($)	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Temporary Equity [Line Items]
Shares Authorized	50,000,000	50,000,000	132,674,735
Shares Issued	0		127,082,605
Shares Outstanding	0		127,082,605	117,788,521	97,420,191
Carrying Amount	$ 0		$ 387,707,000	$ 302,873,000	$ 173,958,000
Aggregate Liquidation Preference	$ 0		$ 399,815,000
Series Seed
Temporary Equity [Line Items]
Shares Authorized			10,199,786
Shares Issued			6,446,322
Shares Outstanding			6,446,322
Issuance Price Per Share (in dollars per share)			$ 0.27
Carrying Amount			$ 1,595,000
Aggregate Liquidation Preference			$ 1,741,000
Series Seed Prime
Temporary Equity [Line Items]
Shares Authorized			8,780,816
Shares Issued			8,643,665
Shares Outstanding			8,643,665
Issuance Price Per Share (in dollars per share)			$ 0.30
Carrying Amount			$ 2,506,000
Aggregate Liquidation Preference			$ 2,593,000
Series A
Temporary Equity [Line Items]
Shares Authorized			11,514,347
Shares Issued			10,359,546
Shares Outstanding			10,359,546
Issuance Price Per Share (in dollars per share)			$ 0.50
Carrying Amount			$ 5,091,000
Aggregate Liquidation Preference			$ 5,180,000
Series B
Temporary Equity [Line Items]
Shares Authorized			14,196,476
Shares Issued			14,196,476
Shares Outstanding			14,196,476
Issuance Price Per Share (in dollars per share)			$ 0.88
Carrying Amount			$ 12,374,000
Aggregate Liquidation Preference			$ 12,500,000
Series C
Temporary Equity [Line Items]
Shares Authorized			25,146,777
Shares Issued			25,146,777
Shares Outstanding			25,146,777
Issuance Price Per Share (in dollars per share)			$ 1.70
Carrying Amount			$ 41,863,000
Aggregate Liquidation Preference			$ 42,800,000
Series D
Temporary Equity [Line Items]
Shares Authorized			30,331,802
Shares Issued			30,331,802
Shares Outstanding			30,331,802
Issuance Price Per Share (in dollars per share)			$ 3.79
Carrying Amount			$ 109,674,000
Aggregate Liquidation Preference			$ 115,000,000
Series E
Temporary Equity [Line Items]
Shares Authorized			22,663,934
Shares Issued			22,663,933
Shares Outstanding			22,663,933
Issuance Price Per Share (in dollars per share)			$ 5.96
Carrying Amount			$ 129,770,000
Aggregate Liquidation Preference			$ 135,001,000
Series F
Temporary Equity [Line Items]
Shares Authorized			9,840,797
Shares Issued			9,294,084
Shares Outstanding			9,294,084
Issuance Price Per Share (in dollars per share)			$ 9.15
Carrying Amount			$ 84,834,000
Aggregate Liquidation Preference			$ 85,000,000