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STOCKHOLDERS’ EQUITY - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	Mar. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Shares reserved for convertible preferred stock outstanding (in shares)	0	0
Options issued and outstanding (in shares)	15,088,477	16,370,673
Total shares of common stock reserved for future issuance	40,086,137	33,769,619
2015 Equity Incentive Plan
Class of Stock [Line Items]
Options issued and outstanding (in shares)	14,620,527	16,181,331
Shares available for future option grants (in shares)	0	0
2021 Equity Incentive Plan
Class of Stock [Line Items]
Options issued and outstanding (in shares)	467,950	189,342
Shares available for future option grants (in shares)	19,808,770	14,306,487
2021 Equity Incentive Plan | RSUs
Class of Stock [Line Items]
RSU's outstanding (in shares)	786,133	160,227
2021 Employee Stock Purchase Plan
Class of Stock [Line Items]
Shares available for future option grants (in shares)	4,402,757	2,932,232

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