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STOCKHOLDERS’ EQUITY (DEFICIT) - Schedule of Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)	0	75,812,755	75,812,755
Convertible preferred stock, shares issued (in shares)	0		70,990,919
Convertible preferred stock, shares outstanding (in shares)	0		70,990,919	62,187,015	60,239,135
Aggregate Liquidation Preference			$ 205,271
Carrying Value, net of issuance cost	$ 0		$ 204,049	$ 102,302	$ 77,331
Series Seed
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)			24,405,575
Convertible preferred stock, shares issued (in shares)			23,301,015
Convertible preferred stock, shares outstanding (in shares)			23,301,015
Aggregate Liquidation Preference			$ 2,330
Carrying Value, net of issuance cost			$ 2,173
Series A
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)			26,212,040
Convertible preferred stock, shares issued (in shares)			26,212,040
Convertible preferred stock, shares outstanding (in shares)			26,212,040
Aggregate Liquidation Preference			$ 7,339
Carrying Value, net of issuance cost			$ 7,375
Series B
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)			6,167,015
Convertible preferred stock, shares issued (in shares)			6,167,015
Convertible preferred stock, shares outstanding (in shares)			6,167,015
Aggregate Liquidation Preference			$ 18,501
Carrying Value, net of issuance cost			$ 18,287
Series C
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)			4,559,065
Convertible preferred stock, shares issued (in shares)			4,559,065
Convertible preferred stock, shares outstanding (in shares)			4,559,065
Aggregate Liquidation Preference			$ 50,013
Carrying Value, net of issuance cost			$ 49,496
Series D
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)			5,820,360
Convertible preferred stock, shares issued (in shares)			2,103,089
Convertible preferred stock, shares outstanding (in shares)			2,103,089
Aggregate Liquidation Preference			$ 27,109
Carrying Value, net of issuance cost			$ 26,893
Series E
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)			8,648,700
Convertible preferred stock, shares issued (in shares)			8,648,695
Convertible preferred stock, shares outstanding (in shares)			8,648,695
Aggregate Liquidation Preference			$ 99,979
Carrying Value, net of issuance cost			$ 99,825

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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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