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General - Net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2017	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Net loss per share
Common stock, par value (in dollars per share)		$ 0.0001		$ 0.0001
Anti dilutive shares		5,168,005	4,223,597
Net loss attributable to common stockholders		$ (11,230)	$ (33,086)
Weighted average common shares outstanding - basic and diluted		147,195,164	145,572,221
Loss per share - Basic and diluted (in dollars per share)		$ (0.08)	$ (0.23)
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