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STOCKHOLDER'S EQUITY - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
May 05, 2020
right
May 01, 2019
$ / shares
Aug. 31, 2020
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
shares
May 01, 2019
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2019
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Class of Stock [Line Items]                    
Share-based compensation expense | $       $ 5,885 $ 17,112 $ 498 $ 20,151   $ 14,728  
Unrecognized compensation cost, weighted average period (in years)                 3 years  
Common stock, shares authorized (in shares)       2,100,000,000         2,100,000,000  
Number of rights declared for each share of common stock | right 1                  
Beneficial ownership acquired (as a percent) 10.00%                  
Beneficial ownership acquired by passive investor (as a percent) 20.00%                  
Vesting based on service conditions                    
Class of Stock [Line Items]                    
Unrecognized compensation cost | $       $ 58,500         $ 58,500  
Vesting based on performance conditions                    
Class of Stock [Line Items]                    
Unrecognized compensation cost | $       3,900         $ 3,900  
Restricted Stock Units (RSUs)                    
Class of Stock [Line Items]                    
Share-based compensation expense | $       $ 1,100            
Award vesting period (in months)     18 months              
Class A Shares                    
Class of Stock [Line Items]                    
Common stock, shares authorized (in shares)       1,000,000,000         1,000,000,000 1,000,000,000
Common stock, par value (in dollars per share) | $ / shares       $ 0.001         $ 0.001 $ 0.001
Class A Shares | Common Shares                    
Class of Stock [Line Items]                    
Conversion of Class B Shares to Class A Shares (in shares)       (7,263) [1] (21,623)     (21,623) (13,323) [2]  
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares)       1,986,278 [1] 164,310   164,310 164,310 4,990,132 [2]  
Class B Shares                    
Class of Stock [Line Items]                    
Common stock, shares authorized (in shares)       1,000,000,000         1,000,000,000 1,000,000,000
Common stock, par value (in dollars per share) | $ / shares       $ 0.001         $ 0.001 $ 0.001
Class B Shares | Common Shares                    
Class of Stock [Line Items]                    
Conversion of Class B Shares to Class A Shares (in shares)       (7,263) [1] (21,623)     (21,623) (13,323) [2]  
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares)       704 [1] 32   32 32 2,049 [2]  
Preferred Stock                    
Class of Stock [Line Items]                    
Common stock, shares authorized (in shares)       100,000,000         100,000,000  
Common stock, par value (in dollars per share) | $ / shares       $ 0.001         $ 0.001  
Special Warrants                    
Class of Stock [Line Items]                    
Special warrants, exercise price per share (in dollars per share) | $ / shares   $ 0.001       $ 0.001        
Special warrants, conversion terms, ownership percentage of common stock (as a percent)   4.99%                
Special warrants, conversion terms, ownership percentage of capital stock or voting interests (as a percent)   22.50%                
Special Warrants | Common Shares                    
Class of Stock [Line Items]                    
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares)       (1,986,982) [1] (164,342)     (164,342) (4,992,181) [2]  
Corporate Expenses                    
Class of Stock [Line Items]                    
Share-based compensation expense | $       $ 5,900 $ 17,100   $ 20,200   $ 14,700  
[1] The Successor Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2020.
[2] The Predecessor Company's Class D Common Stock and Preferred Stock are not presented in the data above as there were no shares issued and outstanding in 2019. The Successor Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2019.