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STOCKHOLDERS' DEFICIT - New Charter (Narrative) (Details) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 26, 2017
--- | --- | --- | ---
Class D Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Shares authorized under New Charter (in shares) | 200,000,000 | 200,000,000 | 200,000,000
Par value of shares authorized under New Charter (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001
Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock authorized under New Charter (in shares) |  |  | 150,000,000
Par value of preferred stock authorized under New Charter (in dollars per share) |  |  | $ 0.001

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