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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 05, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-based compensation |  |  |  |  |  |
Stock-based compensation expense |  | $ 63,600 |  | $ 41,500 | $ 283,300 | $ 111,100
Noncash stock-based compensation expense |  |  |  |  | 197,180 | 111,075
Proceeds from stock options exercised |  |  |  |  | 13,400 | $ 15,400
Stock Plans |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Unrecognized compensation cost |  | 401,600 |  |  | $ 401,600 |
Weighted average period for recognition of cost |  |  |  |  | 2 years 9 months 18 days |
Thrive |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Stock-based compensation expense | $ 166,000 |  |  |  |  |
Noncash stock-based compensation expense |  | $ 4,500 |  |  | $ 19,000 |
Accelerated vesting compensation expense | 65,000 |  |  |  |  |
Thrive | General and Administrative Expense |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Stock-based compensation expense | $ 5,200 |  |  |  |  |
Accelerated vesting compensation expense |  |  | $ 86,200 |  |  |
Option Plan Shares | Thrive |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Accelerated vesting (in shares) |  | 34,167 |  |  | 138,163 |
Restricted Stock Units | Thrive |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Accelerated vesting (in shares) |  | 24,865 |  |  | 58,171 |

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