CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Ordinary shares	Additional paid-in capital	Accumulated other comprehensive income/(loss)	Accumulated deficit	Total
Beginning balance at Dec. 31, 2017	$ 1,947	$ 566,530	$ (3,800)	$ (475,318)	$ 89,359
Beginning balance (in shares) at Dec. 31, 2017	31,339,040				31,339,040
Increase (decrease) in shareholders' equity
Cumulative effect of retroactive implementation of ASC 606 Revenue recognition			1,802	23,116	$ 24,918
Loss for the period				(18,789)	(18,789)
Other comprehensive loss			686		686
Exercise of share options	$ 7	1,555			1,562
Exercise of share options (in shares)	146,161
Restricted share units distributed during the period	$ 17	(17)
Restricted share units distributed during the period (in shares)	286,615
Share-based compensation expense		2,527			2,527
Ending balance at Mar. 31, 2018	$ 1,971	$ 570,595	$ (1,312)	$ (470,991)	$ 100,263
Ending balance (in shares) at Mar. 31, 2018	31,771,816				31,771,816