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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 27, 2020 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for future issuance (in shares) |  |  | 33,769,619 | 91,057,891 |
Options outstanding (in shares) |  |  | 16,370,673 | 15,611,571 |
Aggregate intrinsic value of options exercised |  |  | $ 33,991 | $ 1,700 | $ 5,500
Unrecognized compensation cost related to unvested share-based compensation arrangements granted |  |  | $ 26,800 |  |
Weighted-average fair value of options granted (in dollars per share) |  |  | $ 4.42 | $ 4.80 | $ 5.64
Stock-based compensation, exercise price (in dollars per share) | $ 4.12 |  |  |  |
Incremental stock-based compensation expense | $ 100 |  | $ 300 | $ 300 |
Previously Reported |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options outstanding (in shares) |  |  |  | 15,612,071 |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost, period for recognition |  |  | 2 years 6 months 18 days |  |
RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost, period for recognition |  |  | 2 years 8 months 4 days |  |
Award vesting period |  |  | 4 years |  |
Award cliff vesting period |  |  | 1 year |  |
Unrecognized compensation cost related to outstanding unvested restricted stock units |  |  | $ 3,400 |  |
2021 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation, number of shares authorized (in shares) |  |  | 14,495,829 |  |
Stock-based compensation, period for increase in shares |  | 10 years |  |  |
Percent of outstanding shares |  | 4.00% |  |  |
Shares available for issuance (in shares) |  |  | 14,306,487 | 0 |
Options outstanding (in shares) |  |  | 189,342 | 0 |
2021 Equity Incentive Plan | Class A Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation, number of shares authorized (in shares) |  | 32,349,192 |  |  |
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 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) |  |  | 2,932,232 | 0 |
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) |  | 2,932,232 |  |  |
Stock-based compensation, discount percentage from market price, beginning of period |  | 85.00% |  |  |
2015 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation, number of shares authorized (in shares) |  |  |  | 26,918,466 |
Shares available for issuance (in shares) |  |  | 0 | 4,455,401 |
Options outstanding (in shares) |  |  | 16,181,331 | 15,611,571 |

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