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STOCKHOLDERS' EQUITY - Stock Plans and Share Based Compensation Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 17, 2015 shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) plan shares | Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of share based compensation plans | plan |  |  |  | 2 |
Employee stock purchase plan, compensation expense | $ |  | $ 165,011 | $ 110,389 | $ 429,999 | $ 283,872
Capitalized share-based compensation expense | $ |  | 3,600 | 3,800 | 11,000 | 9,500
Unrecognized compensation cost | $ |  | 1,700,000 |  | $ 1,700,000 |
Unrecognized compensation cost, period for recognition |  |  |  | 2 years 11 months 8 days |
Employee stock purchase plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock purchase plan, compensation expense | $ |  | $ 7,600 | $ 3,300 | $ 24,400 | $ 12,100
2009 Stock Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future issuance (in shares) | 0 |  |  |  |
2009 Stock Option Plan | Stock options, RSAs, and RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity instruments outstanding (in shares) |  | 6,797,068 |  | 6,797,068 |
2015 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future issuance (in shares) |  | 118,883,836 |  | 118,883,836 |
Shares reserved for future issuance (in shares) | 30,000,000 |  |  |  |
Shares reserved for future issuance, percentage of annual increase | 5.00% |  |  |  |
2015 Equity Incentive Plan | Stock options, RSAs, and RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity instruments outstanding (in shares) |  | 16,570,814 |  | 16,570,814 |
2015 Equity Incentive Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for future issuance, amount of annual increase (in shares) | 40,000,000 |  |  |  |

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