Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic and diluted loss per share
Net loss for the period	$ (13,342)	$ (15,223)
Weighted average number of shares outstanding	36,911,604	27,204,230
Basic and diluted loss per share	$ (0.36)	$ (0.56)
Options
Anti-dilutive stock options
Common stock equivalents excluded from the calculations of diluted earnings per share	4,853,349	278,579
Restricted Stock Units
Anti-dilutive stock options
Common stock equivalents excluded from the calculations of diluted earnings per share	339,550