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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