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General - Net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019
Net loss per share
Common stock, par value (in dollars per share)		$ 0.0001		$ 0.0001			$ 0.0001
Anti dilutive shares				5,002,747	3,997,787
Net loss attributable to common stockholders		$ (49,549)	$ (42,485)	$ (60,778)	$ (75,571)
Weighted average common shares outstanding - basic and diluted		147,508,669	145,466,193	147,351,917	145,518,914
Loss per share - Basic and diluted (in dollars per share)		$ (0.34)	$ (0.29)	$ (0.41)	$ (0.52)
Common stock, shares returned						4,570,734
Series A Preferred Stock
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share				4,022,415
Warrants
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share	35,000,000