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STOCKHOLDERS’ EQUITY - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 08, 2021 shares | May 05, 2020 right | May 30, 2019 shares | May 01, 2019 USD ($) $ / shares shares | Aug. 31, 2020 | May 01, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 shares | Feb. 22, 2021 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  | 146,449,688 |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) |  |  |  | 81,453,648 |  |  | 81,453,648 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  | $ 498 |  | $ 26,411 |  | $ 22,862 |  | $ 2,066 |  |  |  |
Employee related charges | $ |  |  |  | $ 1,500 |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |
Dividend distribution, number of rights declared | right |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership acquired (as a percent) |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership acquired, passive investor (as a percent) |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 56,861,941 |  |  | 56,861,941 |  | 57,776,204 |  | 64,726,864 |  |  |  |  |  |
Class B Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 6,947,567 |  |  | 6,947,567 |  | 6,904,910 |  | 6,886,925 |  |  |  |  |  |
Special Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 81,046,593 |  | 74,835,899 |  |  |  |  |  |
Conversion terms, ownership of capital stock or voting interests, percent |  |  |  | 22.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants or rights (in dollars per share) | $ / shares |  |  |  | $ 0.001 |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |
Conversion terms, ownership of common stock, percent |  |  |  | 4.99% |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,201,453
Common Stock | Class A Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) |  |  |  |  |  |  |  |  | 216,921 | [1] | 6,205,617 | [2] |  |  |  |  |
Shares outstanding |  |  |  | 56,861,941 | [1] |  | 56,861,941 | [1] | 57,776,204 | [1],[2] | 64,726,864 | [2] | 32,292,944 | [1],[3] | 32,626,168 | [3] |
Common Stock | Class A Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) | 45,133,811 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Class B Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) |  |  |  |  |  |  |  |  | (10,660) | [1] | 2,095 | [2] |  |  |  |  |
Shares outstanding |  |  |  | 6,947,567 | [1] |  | 6,947,567 | [1] | 6,904,910 | [1],[2] | 6,886,925 | [2] | 555,556 | [1],[3] | 555,556 | [3] |
Common Stock | Class B Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) | 22,337,312 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Special Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) |  |  |  |  |  |  |  |  | 227,581 | [1] | (6,207,712) | [2] |  |  |  |  |
Shares outstanding |  |  |  | 81,453,648 | [1] |  | 81,453,648 | [1] | 81,046,593 | [1],[2] | 74,835,899 | [2] | 0 | [1] |  |  |
Common Stock | Special Warrants | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) | 67,471,123 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Management And Service Providers | Post Emergence Equity Plan | Class A Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 12,770,387 |  |  | 12,770,387 |  |  |  |  |  |  |  |  |  |
Common Stock | Director | Post Emergence Equity Plan | Class A Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 1,596,298 |  |  | 1,596,298 |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  |  | 5,542,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  | 690,994 |  |  | 690,994 |  |  |  |  |  | 690,994 |  |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.70 |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 3,205,360 |  |  |  |  |  |  |  | 556,000 |  |  |  |  |  |
Vesting period of options |  |  |  |  |  | 18 months |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  | $ 3,400 |  |  |  |  |  |
Restricted stock awards, outstanding (in shares) |  |  |  |  |  |  |  |  | 0 |  | 556,000 |  |  |  |  |  |
Restricted stock awards, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0 |  | $ 8.98 |  |  |  |  |  |
Restricted stock awards, vested in period (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Restricted stock awards, vested in period, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Restricted stock awards, forfeited in period (in shares) |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Restricted stock awards, forfeited in period, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Restricted stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  | 752,000 |  |  |  |  |  |
RSA transferability term |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Restricted stock awards, outstanding (in shares) |  |  |  | 5,129,593 |  |  | 5,129,593 |  | 2,648,000 |  | 2,578,000 |  | 5,258,526 |  |  |  |
Restricted stock awards, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 16.47 |  | $ 14.42 |  | $ 3.74 |  |  |  |
Restricted stock awards, vested in period (in shares) |  |  |  |  |  |  | 18,600 |  |  |  | 725,000 |  |  |  |  |  |
Restricted stock awards, vested in period, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.42 |  |  |  | $ 16.32 |  |  |  |  |  |
Restricted stock awards, forfeited in period (in shares) |  |  |  |  |  |  | 110,333 |  |  |  | 97,000 |  |  |  |  |  |
Restricted stock awards, forfeited in period, weighted average grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 3.16 |  |  |  | $ 16.50 |  |  |  |  |  |
Awards granted upon emergence | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of options granted (in years) |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |
All other options | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of options granted (in years) |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Vesting in July 2019 | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vesting percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |
Vesting in July 2019 | Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vesting percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |
Vesting on each of the next four anniversaries | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vesting percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |
Vesting on each of the next four anniversaries | Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, vesting percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |
Vest based solely on continued service | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of options granted (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Vest if certain predetermined performance targets are met | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of options granted (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
[1] | 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 or 2018..
[2] | The Successor Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2020 or 2019.
[3] | The 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 2018 and 2017, respectively.

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