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STOCKHOLDERS’ EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2022
Equity [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | Shares of common stock reserved for future issuance as of March 31, 2022 and December 31, 2021 consist of the following:
| March 31, 2022 |  | December 31, 2021
Shares reserved for convertible preferred stock outstanding | — |  |  | — |
2015 Equity Incentive Plan: |  |  |
Options issued and outstanding | 14,620,527 |  |  | 16,181,331 |
Shares available for future option grants | — |  |  | — |
2021 Equity Incentive Plan: |  |  |
Options issued and outstanding | 467,950 |  |  | 189,342 |
RSUs outstanding | 786,133 |  |  | 160,227 |
Shares available for future grants | 19,808,770 |  |  | 14,306,487 |
2021 Employee Stock Purchase Plan: |  |  |
Shares available for future grants | 4,402,757 |  |  | 2,932,232 |
Total shares of common stock reserved for future issuance | 40,086,137 |  |  | 33,769,619 |

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