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STOCKHOLDER'S EQUITY - Successor Common Stock and Special Warrants (Details) - $ / shares | Sep. 30, 2020 | Dec. 31, 2019
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Class of Stock [Line Items] |  |
Common stock, shares authorized (in shares) | 2,100,000,000 |
Common stock, shares issued (in shares) | 146,392,218 |
Class A Common Stock |  |
Class of Stock [Line Items] |  |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 1,000,000,000 | 1,000,000,000
Common stock, shares issued (in shares) | 63,447,152 | 57,776,204
Class B Common Stock |  |
Class of Stock [Line Items] |  |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 1,000,000,000 | 1,000,000,000
Common stock, shares issued (in shares) | 6,893,636 | 6,904,910
Special Warrants |  |
Class of Stock [Line Items] |  |
Common stock, shares issued (in shares) | 76,051,430 | 81,046,593

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