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STOCKHOLDERS' EQUITY - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2019 | Dec. 31, 2019 | Oct. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based compensation |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Predecessor | Successor | Predecessor | Predecessor | Successor | Successor | Predecessor
Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  |  |  |  | Successor |  | Predecessor
Weighted average grant date fair value of grants |  |  |  |  | $ 3.36 |  | $ 2.92
2016 Incentive Plan | Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Expiration term |  |  |  |  | 10 years |  |
Proceeds from exercise of stock options |  |  |  |  |  |  | $ 0.3
Unrecognized compensation expense stock option |  |  |  |  | $ 0.9 |  | $ 5.2
Weighted average remaining vesting period |  |  |  |  | 1 year 8 months 12 days |  | 10 months 24 days
Aggregate grant date fair value of the shares granted |  |  |  |  | $ 1.9 |  | $ 3.5
2020 Incentive Plan | Stock options |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |
Expiration term |  |  |  |  | 7 years |  |

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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=120381028&loc=d3e5070-113901 + Details
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