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Condensed Consolidated Statements of Shareholders’ Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common shares
Ordinary Shares
Common shares
Deferred Shares
Common shares
Deferred B Shares
Common shares
Deferred C Shares
Additional Paid in Capital
Accumulated other comprehensive loss
Accumulated deficit
Beginning balance at Dec. 31, 2018 $ 232,642 $ 2 $ 0 $ 118 $ 0 $ 361,311 $ (15,488) $ (113,301)
Beginning balance (in shares) at Dec. 31, 2018   40,145,617 34,425 88,893,548 1      
Stockholders' Equity                
Share-based compensation expense 23,940         23,940    
Restricted shares - forfeited (in shares)   (380)            
Issuance of ordinary shares, net of issuance costs 108,815 $ 0       108,815    
Issuance of ordinary shares, net of issuance costs (in shares)   4,830,000            
Exercise of share options 14         14    
Exercise of share option (in shares)   7,141            
Unrealized gain on foreign currency translation (12,865)           (12,865)  
Net loss (82,905)             (82,905)
Ending balance at Sep. 30, 2019 269,641 $ 2 $ 0 $ 118 $ 0 494,080 (28,353) (196,206)
Ending balance (in shares) at Sep. 30, 2019   44,982,378 34,425 88,893,548 1      
Beginning balance at Jun. 30, 2019 298,222 $ 2 $ 0 $ 118 $ 0 486,369 (19,309) (168,958)
Beginning balance (in shares) at Jun. 30, 2019   44,981,860 34,425 88,893,548 1      
Stockholders' Equity                
Share-based compensation expense 7,709         7,709    
Exercise of share options 2         2    
Exercise of share option (in shares)   518            
Unrealized gain on foreign currency translation (9,044)           (9,044)  
Net loss (27,248)             (27,248)
Ending balance at Sep. 30, 2019 269,641 $ 2 $ 0 $ 118 $ 0 494,080 (28,353) (196,206)
Ending balance (in shares) at Sep. 30, 2019   44,982,378 34,425 88,893,548 1      
Beginning balance at Dec. 31, 2019 254,839 $ 2 $ 0 $ 118 $ 0 500,560 (8,691) (237,150)
Beginning balance (in shares) at Dec. 31, 2019   44,983,006 34,425 88,893,548 1      
Stockholders' Equity                
Share-based compensation expense 15,786         15,786    
Restricted shares - forfeited (in shares)   (1,969)            
Issuance of ordinary shares, net of issuance costs 73,953 $ 1       73,952    
Issuance of ordinary shares, net of issuance costs (in shares)   7,250,000            
Exercise of share options $ 71         71    
Exercise of share option (in shares) 67,839 67,839            
Unrealized gain on foreign currency translation $ (8,605)           (8,605)  
Net loss (99,233)             (99,233)
Ending balance at Sep. 30, 2020 236,811 $ 3 $ 0 $ 118 $ 0 590,369 (17,296) (336,383)
Ending balance (in shares) at Sep. 30, 2020   52,298,876 34,425 88,893,548 1      
Beginning balance at Jun. 30, 2020 258,952 $ 3 $ 0 $ 118 $ 0 586,110 (28,211) (299,068)
Beginning balance (in shares) at Jun. 30, 2020   52,250,404 34,425 88,893,548 1      
Stockholders' Equity                
Share-based compensation expense 4,245         4,245    
Restricted shares - forfeited (in shares)   0            
Exercise of share options 14         14    
Exercise of share option (in shares)   48,472            
Unrealized gain on foreign currency translation 10,915           10,915  
Net loss (37,315)             (37,315)
Ending balance at Sep. 30, 2020 $ 236,811 $ 3 $ 0 $ 118 $ 0 $ 590,369 $ (17,296) $ (336,383)
Ending balance (in shares) at Sep. 30, 2020   52,298,876 34,425 88,893,548 1