CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for receivables	$ 8,088	$ 26,584
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	100,000,000	150,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares issued (in shares)	145,885,996
Common stock, shares outstanding (in shares)	145,885,996
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)	57,670,714	32,292,944
Common stock, shares outstanding (in shares)	57,670,714
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)	6,925,976	555,556
Common stock, shares outstanding (in shares)	6,925,976
Special Warrants
Class of Stock [Line Items]
Common stock, shares issued (in shares)	81,289,306
Common stock, shares outstanding (in shares)	81,289,306
Treasury stock
Class of Stock [Line Items]
Treasury stock, shares	125,210	805,982