Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement Of Comprehensive Income [Abstract]      
Operating income other than revenue $ 20,113 $ 17 $ 16
OPERATING EXPENSES      
Research and development expenses (53,136) (67,536) (88,053)
General and administrative expenses (21,491) (12,182) (19,058)
Total operating expenses (74,627) (79,718) (107,111)
OPERATING LOSS (54,514) (79,701) (107,095)
Finance income 600 648 854
Finance expense (4,251) (3,879) (2,482)
NET LOSS BEFORE TAX (58,165) (82,932) (108,723)
Income tax expense (212) (34) (67)
NET LOSS FOR THE YEAR $ (58,377) $ (82,966) $ (108,790)
Net loss per share      
Basic and diluted $ (0.78) $ (1.67) $ (2.49)
Items that will not be reclassified to profit and loss      
Remeasurements on post-employment benefit plans, net of tax $ 796 $ 982 $ (4,694)
TOTAL OTHER COMPREHENSIVE INCOME / (LOSS) 796 982 (4,694)
TOTAL COMPREHENSIVE LOSS FOR THE YEAR $ (57,581) $ (81,984) $ (113,484)