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STOCKHOLDER'S EQUITY (DEFICIT) - Balances of Predecessor Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | Sep. 30, 2019 | May 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Common stock issued |  |  | $ 92
Common stock, shares issued (in shares) | 145,885,996 |  |
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock issued | $ 58 |  | $ 32
Common stock, par value (in dollars per share) | $ 0.001 |  | $ 1.000
Common stock, shares authorized (in shares) | 1,000,000,000 |  | 400,000,000
Common stock, shares issued (in shares) | 57,670,714 | 56,861,941 | 32,292,944
Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock issued | $ 7 |  | $ 1
Common stock, par value (in dollars per share) | $ 0.001 |  | $ 1.000
Common stock, shares authorized (in shares) | 1,000,000,000 |  | 150,000,000
Common stock, shares issued (in shares) | 6,925,976 | 6,947,567 | 555,556
Class C Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock issued |  |  | $ 59
Common stock, par value (in dollars per share) |  |  | $ 0.001
Common stock, shares authorized (in shares) |  |  | 100,000,000
Common stock, shares issued (in shares) |  |  | 58,967,502
Class D Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock issued |  |  | $ 0
Common stock, par value (in dollars per share) |  |  | $ 0.001
Common stock, shares authorized (in shares) |  |  | 200,000,000
Common stock, shares issued (in shares) |  |  | 0

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