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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