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Redeemable Convertible Preferred Stock - Summary of Redeemable Convertible Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Temporary Equity [Line Items]
Temporary Equity, Shares Authorized	0	182,772,372
Temporary Equity, Shares Issued	0	182,772,372
Temporary Equity, Shares Outstanding	0	182,772,372
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		$ 139,576
Temporary Equity, Liquidation Preference		$ 139,338
Series Seed [Member]
Temporary Equity [Line Items]
Temporary Equity Issue Price		$ 1.01
Temporary Equity, Shares Authorized		1,010,456
Temporary Equity, Shares Issued		1,010,456
Temporary Equity, Shares Outstanding		1,010,456
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		$ 1,789
Temporary Equity, Liquidation Preference		$ 1,020
Series Seed-1 [Member]
Temporary Equity [Line Items]
Temporary Equity Issue Price		$ 1.92
Temporary Equity, Shares Authorized		1,787,640
Temporary Equity, Shares Issued		1,787,640
Temporary Equity, Shares Outstanding		1,787,640
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		$ 3,718
Temporary Equity, Liquidation Preference		$ 3,430
Series A [Member]
Temporary Equity [Line Items]
Temporary Equity Issue Price		$ 2.15
Temporary Equity, Shares Authorized		6,120,111
Temporary Equity, Shares Issued		6,120,111
Temporary Equity, Shares Outstanding		6,120,111
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		$ 12,851
Temporary Equity, Liquidation Preference		$ 13,136
Series B [Member]
Temporary Equity [Line Items]
Temporary Equity Issue Price		$ 4.29
Temporary Equity, Shares Authorized		5,097,566
Temporary Equity, Shares Issued		5,097,566
Temporary Equity, Shares Outstanding		5,097,566
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		$ 21,737
Temporary Equity, Liquidation Preference		$ 21,882
Series C [Member]
Temporary Equity [Line Items]
Temporary Equity Issue Price		$ 0.59
Temporary Equity, Shares Authorized		168,756,599
Temporary Equity, Shares Issued		168,756,599
Temporary Equity, Shares Outstanding		168,756,599
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		$ 99,481
Temporary Equity, Liquidation Preference		$ 99,870

X

- Definition

As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form.

+ References

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-Topic 480
-SubTopic 10
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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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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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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. 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 number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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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