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STOCKHOLDER'S EQUITY (DEFICIT) - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 30, 2019 | May 01, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | May 01, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  | $ 17,112 | $ 456 | $ 498 | $ 20,151 |  |
Unrecognized compensation cost |  |  | $ 63,100 |  |  | $ 63,100 | $ 63,100 |
Unrecognized compensation cost, weighted average period (in years) |  |  |  |  |  |  | 3 years 7 months 6 days |
Special Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Special warrants, exercise price per share (in dollars per share) |  | $ 0.001 |  |  | $ 0.001 |  |  |
Special warrants, conversion terms, ownership percentage of common stock |  | 4.99% |  |  |  |  |  |
Special warrants, conversion terms, ownership percentage of capital stock or voting interests |  | 22.50% |  |  |  |  |  |
Common Shares | Class A Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) |  |  | 185,933 |  |  | 185,933 |  |
Common Shares | Class B Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) |  |  | (21,591) |  |  | (21,591) |  |
Common Shares | Special Warrants |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Conversion of Special Warrants and Class B Shares to Class A Shares (in shares) |  |  | (164,342) |  |  | (164,342) |  |
Stock Option |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock options granted (in shares) | 5,542,668 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Restricted stock granted (in shares) | 3,205,360 |  |  |  |  |  |  |
Vesting period one | Stock Option |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 20.00% |
Vesting period one | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 20.00% |
Vesting period two | Stock Option |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 20.00% |
Vesting period two | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  |  |  |  | 20.00% |
Corporate Expenses |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense |  |  | $ 17,100 | $ 500 | $ 500 | $ 20,200 |  | $ 1,628
Post Emergence Equity Plan | Management And Service Providers | Common Shares | Class A Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  | 12,770,387 |  |  | 12,770,387 |  |  |
Post Emergence Equity Plan | Non-Employee Board Members | Common Shares | Class A Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  | 1,596,298 |  |  | 1,596,298 |  |  |

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