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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance (in shares) |  | 40,086,137 |  | 33,769,619
Unrecognized compensation cost related to unvested share-based compensation arrangements granted |  | $ 24.3 |  |
Weighted-average fair value of options granted (in dollars per share) |  | $ 0.46 | $ 2.23 |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost, period for recognition |  | 2 years 3 months |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost, period for recognition |  | 3 years 3 months 18 days |  |
Award vesting period |  | 4 years |  |
Award cliff vesting pperiod |  | 1 year |  |
Unrecognized compensation costs |  | $ 7.7 |  |
2021 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation, period for increase in shares | 10 years |  |  |
Percent of outstanding shares | 4.00% |  |  |
2021 Equity Incentive Plan | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance (in shares) | 21,062,853 |  |  |
Stock-based compensation, maximum number of shares available for issue on the exercise of incentive stock options (in shares) | 100,000,000 |  |  |
2021 Employee Stock Purchase Plan | 2021 ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation, period for increase in shares | 10 years |  |  |
Percent of outstanding shares | 1.00% |  |  |
Stock-based compensation, number of additional shares allowable under the plan (in shares) | 2,850,000 |  |  |
Stock-based compensation, purchase period | 6 months |  |  |
2021 Employee Stock Purchase Plan | Class A Common Stock | 2021 ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock reserved for future issuance (in shares) | 4,402,757 |  |  |
Stock-based compensation, discount percentage from market price, beginning of period | 85.00% |  |  |

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