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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Ordinary shares
Additional paid-in capital
Accumulated other comprehensive income / (loss)
Accumulated deficit
Total
Beginning balance at Dec. 31, 2019 $ 2,651 $ 986,803 $ (6,689) $ (659,707) $ 323,058
Beginning balance (in shares) at Dec. 31, 2019 43,711,954        
Increase (decrease) in shareholders' equity          
Income / Loss for the period       (125,024) (125,024)
Other comprehensive Income / Loss     16,596   16,596
Exercise of share options $ 29 7,169     7,198
Exercise of share options (in shares) 498,678        
Restricted and performance share units distributed during the period $ 31 (31)      
Restricted and performance share units distributed during the period (in shares) 560,986        
Share-based compensation expense   21,831     21,831
Issuance of ordinary shares relating to employee stock purchase plan   246     246
Issuance of ordinary shares relating to employee stock purchase plan (in shares) 6,181        
Ending balance at Dec. 31, 2020 $ 2,711 1,016,018 9,907 (784,731) 243,905
Ending balance (in shares) at Dec. 31, 2020 44,777,799        
Increase (decrease) in shareholders' equity          
Income / Loss for the period       329,589 329,589
Other comprehensive Income / Loss     (38,763)   (38,763)
Issuance of ordinary shares $ 55 29,509     29,564
Issuance of ordinary shares (in shares) 921,730        
Income tax benefit of past share issuance cost   3,047     3,047
Exercise of share options $ 15 2,638     2,653
Exercise of share options (in shares) 241,496        
Restricted and performance share units distributed during the period $ 21 (21)      
Restricted and performance share units distributed during the period (in shares) 352,886        
Share-based compensation expense   25,635     25,635
Issuance of ordinary shares relating to employee stock purchase plan   146     146
Issuance of ordinary shares relating to employee stock purchase plan (in shares) 4,724        
Ending balance at Dec. 31, 2021 $ 2,802 1,076,972 (28,856) (455,142) $ 595,776
Ending balance (in shares) at Dec. 31, 2021 46,298,635       46,298,635
Increase (decrease) in shareholders' equity          
Income / Loss for the period       (126,789) $ (126,789)
Other comprehensive Income / Loss     (29,435)   (29,435)
Income tax benefit of past share issuance cost   808     808
Exercise of share options $ 8 1,272     1,280
Exercise of share options (in shares) 152,356        
Restricted and performance share units distributed during the period $ 27 (27)      
Restricted and performance share units distributed during the period (in shares) 505,799        
Share-based compensation expense   34,204     34,204
Issuance of ordinary shares relating to employee stock purchase plan $ 1 164     165
Issuance of ordinary shares relating to employee stock purchase plan (in shares) 11,242        
Ending balance at Dec. 31, 2022 $ 2,838 $ 1,113,393 $ (58,291) $ (581,931) $ 476,009
Ending balance (in shares) at Dec. 31, 2022 46,968,032       46,968,032