v3.19.3

STOCKHOLDERS' EQUITY - Stock Plans and Share Based Compensation Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 17, 2015 shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) plan shares | Sep. 30, 2018 USD ($)
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 | $ |  | $ 77,426 | $ 58,913 | $ 217,980 | $ 157,856
Capitalized share-based compensation expense | $ |  | 2,400 | 2,000 | 6,000 | 6,300
Unrecognized compensation cost, options | $ |  | 745,000 |  | 745,000 |
Employee stock purchase plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock purchase plan, compensation expense | $ |  | $ 5,100 | $ 2,000 | $ 14,100 | $ 6,300
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost, period for recognition |  |  |  | 2 years 9 months 18 days |
2009 Stock Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future issuance (in shares) |  | 0 |  | 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) |  | 20,422,313 |  | 20,422,313 |
2015 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future issuance (in shares) |  | 82,968,841 |  | 82,968,841 |
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) |  | 21,822,262 |  | 21,822,262 |
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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