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Stockholders' Equity - eXponential Stock Performance Plan (Details) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 12, 2019 | May 24, 2018 USD ($) shares | Jan. 31, 2019 shares | Dec. 31, 2019 USD ($) tranche shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
New option granted (in shares) | shares |  |  |  | 0 | 0 | 0
First tranche |  | $ 2,500.0 |  |  |  |
Incremental increase |  | $ 1,000.0 |  |  |  |
Stock based compensation expense |  |  |  | $ 37.4 |  |
Number of Options expected to vest | shares |  |  |  | 4,800,000 |  |
Weighted average period |  |  |  | 6 years |  |
eXponential Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of units, granted (in shares) | shares |  |  | 60 |  |  |
Stock based compensation expense |  |  |  | $ 17.5 |  |
eXponential Stock Units | 2019 eXponential Stock Performance Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock, expiration period | 9 years |  |  |  |  |
Number of vesting tranches of share-based awards | tranche |  |  |  | 12 |  |
New option granted (in shares) | shares |  |  |  | 5,900,000 |  |
First tranche |  |  |  | $ 2,500.0 |  |
Incremental increase |  |  |  | 1,000.0 |  |
Stock based compensation expense |  |  |  | $ 17.5 |  |
Number of Options expected to vest | shares |  |  |  | 4,200,000 |  |
Total unrecognized stock-based compensation expense for operational goals |  |  |  | $ 139.8 |  |
Unrecognized stock-based compensation expense |  |  |  | $ 35.9 |  |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
New option granted (in shares) | shares |  | 6,365,856 |  |  |  |
Weighted average period |  |  |  | 5 years 10 months 24 days |  |

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