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STOCKHOLDERS' EQUITY - Incentive Plans (Details) shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 06, 2017 shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) employee shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 shares | Sep. 09, 2016 shares
Stock-based compensation |  |  |  |  |  |  |
Senior executives who departed | employee |  |  |  | 4 |  |  |
General and administrative |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Compensation expense recorded | $ |  | $ 1.0 | $ 4.2 | $ (5.8) | $ 7.8 |  |
2016 Incentive Plan |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Incremental reduction to stock-based compensation expense | $ |  |  |  | $ 8.4 |  |  |
2016 Incentive Plan | Common Stock |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Aggregate number of shares available | 19.0 |  |  |  |  |  | 10.0
Increase in shares available for issuance | 9.0 |  |  |  |  |  |
Number of calculation days for which shares will be available for issuance | 20 days |  |  |  |  |  |
Maximum number of shares that remained reserved for issuance under the Plan |  | 5.8 |  | 5.8 |  | 4.9 |

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