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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Jan. 29, 2020 | Apr. 06, 2017
General and administrative |  |  |  |  |
Stock-based compensation |  |  |  |  |
Allocated share based compensation credit |  | $ 6,800,000 |  |  |
Compensation expense recorded | $ 400,000 |  |  |  |
2016 Incentive Plan |  |  |  |  |
Stock-based compensation |  |  |  |  |
Incremental reduction to stock-based compensation expense |  | $ 8,400,000 |  |  |
2016 Incentive Plan | Common Stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Aggregate number of shares available |  |  |  |  | 19,000,000
2016 Incentive Plan | Stock options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Share Based Compensation Arrangements by Share Based Payment Award Options Annual Vesting Percentage. |  |  | 33.33% |  |
Vesting period |  |  | 3 years |  |
Expiration term |  |  | 10 years |  |
Weighted average remaining vesting period |  | 9 months 18 days |  |  |
Number of Shares |  |  |  |  |
Granted (in shares) |  | 0 |  |  |
Restricted stock |  |  |  |  |
Unrecognized compensation expense stock option |  | $ 1,500,000 |  |  |
2020 Incentive Plan | Common Stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Aggregate number of shares available |  |  |  | 1,500,000 |
2020 Incentive Plan | Common Stock | Maximum |  |  |  |  |
Stock-based compensation |  |  |  |  |
Maximum number of shares that remained reserved for issuance under the Plan | 200,000 |  |  |  |
2020 Incentive Plan | Stock options |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period | 4 years |  |  |  |
Expiration term | 7 years |  |  |  |
Weighted average remaining vesting period | 2 years 4 months 24 days |  |  |  |
Number of Shares |  |  |  |  |
Granted (in shares) | 500,000 |  |  |  |
Restricted stock |  |  |  |  |
Weighted average grant date fair value of the shares granted | $ 28.32 |  |  |  |
Unrecognized compensation expense stock option | $ 1,500,000 |  |  |  |
2020 Incentive Plan | Stock options | Minimum |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Exercised (in dollars per share) | $ 18.91 |  |  |  |
2020 Incentive Plan | Stock options | Maximum |  |  |  |  |
Weighted Average Exercise Price Per Share |  |  |  |  |
Exercised (in dollars per share) | $ 37.83 |  |  |  |

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- Definition The aggregate weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) granted during the period. + References No definition available. + Details
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