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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 06, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Sep. 09, 2016
General and administrative |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Compensation expense recorded |  | $ (2.3) | $ 4.4 | $ (8.0) | $ 12.2 |  |
2016 Incentive Plan |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Incremental reduction to stock-based compensation expense |  | $ 1.1 |  | $ 9.5 |  |  |
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 |  | 8.0 |  | 8.0 |  | 4.9 |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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