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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Ordinary shares
Additional paid-in capital
Accumulated other comprehensive (loss)/income
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       (70,550) (70,550)
Other comprehensive Income (loss)     (630)   (630)
Exercise of share options $ 12 3,390     3,402
Exercise of share options (in shares) 203,940        
Restricted and performance share units distributed during the period $ 29 (29)      
Restricted and performance share units distributed during the period (in shares) 525,506        
Share-based compensation expense   10,078     10,078
Issuance of ordinary shares relating to employee stock purchase plan   147     147
Issuance of ordinary shares relating to employee stock purchase plan (in shares) 3,005        
Ending balance at Jun. 30, 2020 $ 2,692 1,000,389 (7,319) (730,257) 265,505
Ending balance (in shares) at Jun. 30, 2020 44,444,405        
Beginning balance at Mar. 31, 2020 $ 2,683 992,136 (11,966) (687,706) 295,147
Beginning balance (in shares) at Mar. 31, 2020 44,299,596        
Increase (decrease) in shareholders' equity          
Income (Loss) for the period       (42,551) (42,551)
Other comprehensive Income (loss)     4,647   4,647
Exercise of share options $ 9 2,461     2,470
Exercise of share options (in shares) 139,178        
Restricted and performance share units distributed during the period (in shares) 4,427        
Share-based compensation expense   5,723     5,723
Issuance of ordinary shares relating to employee stock purchase plan   69     69
Issuance of ordinary shares relating to employee stock purchase plan (in shares) 1,204        
Ending balance at Jun. 30, 2020 $ 2,692 1,000,389 (7,319) (730,257) 265,505
Ending balance (in shares) at Jun. 30, 2020 44,444,405        
Increase (decrease) in shareholders' equity          
Accumulated deficit         (784,731)
Beginning balance at Dec. 31, 2020 $ 2,711 1,016,018 9,907 (784,731) $ 243,905
Beginning balance (in shares) at Dec. 31, 2020 44,777,799       44,777,799
Increase (decrease) in shareholders' equity          
Income (Loss) for the period       357,912 $ 357,912
Other comprehensive Income (loss)     (14,502)   (14,502)
Issuance of ordinary shares $ 55 29,509     29,564
Issuance of ordinary shares (in shares) 921,730        
Tax benefit past share issuance cost   2,977     2,977
Exercise of share options $ 5 906     911
Exercise of share options (in shares) 71,976        
Restricted and performance share units distributed during the period $ 17 (17)      
Restricted and performance share units distributed during the period (in shares) 277,571        
Share-based compensation expense   12,792     12,792
Issuance of ordinary shares relating to employee stock purchase plan   49     49
Issuance of ordinary shares relating to employee stock purchase plan (in shares) 1,174        
Ending balance at Jun. 30, 2021 $ 2,788 1,062,234 (4,595) (426,819) $ 633,608
Ending balance (in shares) at Jun. 30, 2021 46,050,250       46,050,250
Beginning balance at Mar. 31, 2021 $ 2,780 1,049,850 2,347 (826,287) $ 228,690
Beginning balance (in shares) at Mar. 31, 2021 45,924,729        
Increase (decrease) in shareholders' equity          
Income (Loss) for the period       399,468 399,468
Other comprehensive Income (loss)     (6,942)   (6,942)
Issuance of ordinary shares $ 3 1,862     1,865
Issuance of ordinary shares (in shares) 61,845        
Tax benefit past share issuance cost   2,977     2,977
Exercise of share options $ 4 515     519
Exercise of share options (in shares) 55,194        
Restricted and performance share units distributed during the period $ 1 (1)      
Restricted and performance share units distributed during the period (in shares) 8,482        
Share-based compensation expense   7,031     7,031
Ending balance at Jun. 30, 2021 $ 2,788 $ 1,062,234 $ (4,595) $ (426,819) $ 633,608
Ending balance (in shares) at Jun. 30, 2021 46,050,250       46,050,250
Increase (decrease) in shareholders' equity          
Accumulated deficit         $ (426,819)