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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Allowance for receivables $ 3,081 $ 26,584
Class of Stock [Line Items]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 150,000,000 150,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Series A Preferred Stock    
Class of Stock [Line Items]    
Preferred stock, par value (in dollars per share) $ 0.001  
Preferred stock, shares authorized 60,000  
Preferred stock, shares issued 60,000  
Class A Common Stock    
Class of Stock [Line Items]    
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) 56,873,782 32,292,944
Common stock, shares outstanding (in shares) 56,873,782  
Class B Common Stock    
Class of Stock [Line Items]    
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) 6,947,567 555,556
Common stock, shares outstanding (in shares) 6,947,567  
Special Warrants    
Class of Stock [Line Items]    
Common stock, shares issued (in shares) 81,453,648  
Common stock, shares outstanding (in shares) 81,453,648  
Treasury stock    
Class of Stock [Line Items]    
Treasury stock, shares 0 805,982