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STOCK INCENTIVE PLANS - 2009 and 2019 Stock Plans (Details) - shares | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Jan. 31, 2018 | Nov. 09, 2021 | Sep. 30, 2021 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized (in shares) | 25,204,250 |  |  |  |
The 2009 Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized (in shares) |  | 17,030,280 |  |  | 16,495,150
Additional shares authorized (in shares) |  | 535,130 |  |  |
The 2019 Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Additional shares authorized (in shares) | 8,173,970 |  |  |  |
The 2019 Option Plan | Common Class A |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized (in shares) |  |  | 16,856,770 | 4,339,690 |
The 2019 Option Plan | Common Stock, LT50 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized (in shares) |  |  | 16,856,770 |  |
The 2019 Option Plan | Restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized (in shares) |  |  |  | 8,679,380 |
The 2019 Option Plan | Restricted stock units | Common Class A |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized (in shares) |  |  |  | 4,339,690 |
The 2019 Option Plan | Restricted stock units | Common Stock, LT50 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized (in shares) |  |  |  | 4,339,690 |

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