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STOCKHOLDERS’ EQUITY (DEFICIT) - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Shares reserved for convertible preferred stock outstanding (in shares)	0	70,990,919
Options issued and outstanding (in shares)	16,370,673	15,611,571
Total shares of common stock reserved for future issuance	33,769,619	91,057,891
2015 Equity Incentive Plan
Class of Stock [Line Items]
Options issued and outstanding (in shares)	16,181,331	15,611,571
Shares available for future option grants (in shares)	0	4,455,401
2021 Equity Incentive Plan
Class of Stock [Line Items]
Options issued and outstanding (in shares)	189,342	0
Shares available for future option grants (in shares)	14,306,487	0
2021 Equity Incentive Plan | RSUs
Class of Stock [Line Items]
RSU's outstanding (in shares)	160,227	0
2021 Employee Stock Purchase Plan
Class of Stock [Line Items]
Shares available for future option grants (in shares)	2,932,232	0

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Aggregate number of nonredeemable convertible preferred shares reserved for future issuance.

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