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Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic and diluted loss per share
Net loss for the period	$ (22,262)	$ (22,269)	$ (14,602)	$ (15,223)	$ (15,187)	$ (14,000)	$ (12,104)	$ (13,599)	$ (74,356)	$ (54,890)	$ (46,964)
Adjustment to redemption value of silent partnerships											(3,875)
Net loss attributable to shareholders									$ (74,356)	$ (54,890)	$ (50,839)
Weighted average number of shares outstanding									29,830,669	21,478,320	10,583,950
Excluded treasury shares on December 31											2,819
Basic and diluted loss per share	$ (0.61)	$ (0.79)	$ (0.54)						$ (2.49)	$ (2.56)	$ (4.80)
Anti-dilutive stock options
Stock options									3,338,999	1,904,320	1,327,060