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General - Net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 12, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Net loss per share
Common stock, par value (in dollars per share)		$ 0.0001		$ 0.0001		$ 0.0001
Net loss attributable to common stockholders		$ (134,311)	$ (29,854)	$ (200,191)	$ (80,858)
Weighted average common shares outstanding - basic and diluted		150,207,483	151,663,670	150,140,577	152,010,290
Loss per share - Basic and diluted		$ (0.89)	$ (0.20)	$ (1.33)	$ (0.53)
Series A Preferred Stock
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share				5,402,954
Warrants
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share	35,000,000