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General - Net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jul. 12, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Net loss per share
Common stock, par value (in dollars per share)		$ 0.0001		$ 0.0001
Net loss attributable to common stockholders		$ (30,821)	$ (24,908)
Weighted average common shares outstanding - basic and diluted		150,142,955	152,140,117
Loss per share - Basic and diluted		$ (0.21)	$ (0.16)
Series A Preferred Stock
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share		5,586,344
Warrants
Net loss per share
Number of anti-dilutive shares excluded from computation of diluted loss per share	35,000,000