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STOCKHOLDERS’ EQUITY - Schedule of Common Stock Reserved for Future Issuance (Details) - shares | Mar. 31, 2022 | Dec. 31, 2021
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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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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