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STOCKHOLDERS' EQUITY - Restricted Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Oct. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-based compensation |  |  |  |  |
Number of shares granted |  | 4,163,348 |  | 2,326,961 | 2,022,432
Weighted average grant date fair value of the shares granted |  | $ 5.4 |  |  |
Employees and non-employee directors |  |  |  |  |
Stock-based compensation |  |  |  |  |
Number of shares granted | 0 |  |  |  |
2016 Incentive Plan | Restricted Stock |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 3 years |  |
Percentage of awards other than options vesting on the annual anniversary date of the grant |  |  | 33.33% |  |
Weighted average grant date fair value of the shares granted |  |  |  | $ 12.7 | $ 14.3
Unrecognized compensation expense other than options |  |  |  | $ 6.1 | $ 3.2
Weighted average remaining vesting period |  |  |  | 1 year 1 month 6 days | 1 year 4 months 24 days
2016 Incentive Plan | Restricted Stock | Non-employee director |  |  |  |  |
Stock-based compensation |  |  |  |  |
Vesting period |  |  | 6 months |  |

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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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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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