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STOCK INCENTIVE PLANS - Stock Option Narratives (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 USD ($) shares | Dec. 31, 2021 USD ($) employee $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Repurchase of common stock |  |  |  | $ 14,000
Share-based Payment Arrangement, Expense |  | $ 14,574,000 | $ 17,837,000 | 3,487,000
Number of employees impacted by plan modification | employee |  | 42 |  |
Intrinsic value of options exercised |  | $ 80,700,000 | 11,300,000 | 4,700,000
Intrinsic value of options outstanding | $ 86,800,000 | $ 302,800,000 | $ 86,800,000 | $ 40,400,000
Weighted average grant date fair value of options granted (usd per share) | $ / shares |  | $ 6.87 | $ 1.69 | $ 1.65
Issuance of common stock upon exercise of stock options |  | $ 3,505,000 | $ 1,301,000 | $ 482,000
Common stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares repurchased (shares) | shares |  |  |  | 55,200
Repurchase of common stock |  |  |  | $ 1,794,703
Common stock | Stock-Based Compensation |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Repurchase of common stock |  |  |  | 1,780,784
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (years) |  | 4 years |  |
Exercise cost |  |  |  | 13,919
Share-based Payment Arrangement, Expense |  | $ 3,425,000 | 2,582,000 | $ 3,487,000
Share-based compensation expense not yet recognized | 10,800,000 | $ 13,200,000 | $ 10,800,000 |
Share-based compensation not yet recognized, recognition period (years) |  | 1 year 8 months 12 days | 3 years 8 months 12 days |
Stock options | Common stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares repurchased (shares) | shares |  | 0 | 0 |
Stock options | The 2009 Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (years) |  | 4 years |  |
Stock options | The 2019 Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period (years) |  | 4 years |  |
Non Statutory Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Purchase price as a percentage of common stock (percent) |  | 100.00% |  |
Ten Percent Holder | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Purchase price as a percentage of common stock (percent) |  | 110.00% |  |
Other Than Ten Percent Holder | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Purchase price as a percentage of common stock (percent) |  | 100.00% |  |
Chief Executive Officer |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Share-based Payment Arrangement, Expense | $ 11,100,000 |  |  |
Chief Executive Officer | Weighted-average stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares subject to repurchase related to stock options early exercised and not yet vested (in shares) | shares | 0 | 1,437,760 | 0 |
Shares subject to repurchase related to stock options early exercised and not yet vested |  | $ 2,400,000 |  |

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