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STOCKHOLDERS' EQUITY - Stock Options (Details) - USD ($)
$ 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, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-based compensation              
Financial Designation, Predecessor and Successor [Fixed List] Predecessor Successor Predecessor Predecessor   Predecessor Predecessor
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           $ 5.2 $ 13.0
Weighted average remaining vesting period           10 months 24 days 1 year 2 months 12 days
Weighted average grant date fair value of the shares granted           $ 3.5 $ 7.8