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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.

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