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Consolidated Statements of Shareholders’ Equity - USD ($)
$ in Thousands
Total
Ordinary shares
Deferred Shares
Deferred B shares
Deferred C Shares
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 Sep. 30, 2015 $ 10,501         $ 0 $ 0 $ 0 $ 0 $ 27,835 $ (1,709) $ (15,625)
Beginning balance (shares) at Sep. 30, 2015           6,713,663 0 0 0      
Increase (Decrease) in Stockholders' Equity                        
Issuance, net of issuance cost 33,421                 33,421    
Issuance, net of issuance cost (shares)           7,207,881            
Share-based compensation expense 2,257                 2,257    
Unrealized loss on foreign currency translation (2,942)                   (2,942)  
Net loss (12,550)                     (12,550)
Ending, balance at Sep. 30, 2016 30,687         $ 0 $ 0 $ 0 $ 0 63,513 (4,651) (28,175)
Ending balance (shares) at Sep. 30, 2016           13,921,544 0 0 0      
Increase (Decrease) in Stockholders' Equity                        
Issuance, net of issuance cost 127,686         $ 1       127,685    
Issuance, net of issuance cost (shares)           16,041,198            
Share-based compensation expense 3,153                 3,153    
Unrealized loss on foreign currency translation 802                   802  
Net loss (19,727)                     (19,727)
Ending, balance at Sep. 30, 2017 $ 142,601         $ 1 $ 0 $ 0 $ 0 194,351 (3,849) (47,902)
Ending balance (shares) at Sep. 30, 2017 29,962,742         29,962,742 0 0 0      
Increase (Decrease) in Stockholders' Equity                        
Net loss $ (7,524)                      
Ending, balance at Dec. 31, 2017 137,515                      
Beginning balance at Sep. 30, 2017 $ 142,601         $ 1 $ 0 $ 0 $ 0 194,351 (3,849) (47,902)
Beginning balance (shares) at Sep. 30, 2017 29,962,742         29,962,742 0 0 0      
Increase (Decrease) in Stockholders' Equity                        
Issuance, net of issuance cost $ 156,803         $ 1   $ 118 $ 0 156,802    
Issuance, net of issuance cost (shares)           10,183,440 34,425 88,893,548 1      
Share-based compensation expense 6,765                 6,765    
Unrealized loss on foreign currency translation (6,071)                   (6,071)  
Net loss (44,751)                     (44,751)
Ending, balance at Sep. 30, 2018 $ 255,465         $ 2 $ 0 $ 118 $ 0 357,918 (9,920) (92,653)
Ending balance (shares) at Sep. 30, 2018 129,074,156 40,146,182 34,425 88,893,548 1 40,146,182 34,425 88,893,548 1      
Increase (Decrease) in Stockholders' Equity                        
Share-based compensation expense $ 3,393                 3,393    
Restricted shares - forfeited (shares)           (565)            
Unrealized loss on foreign currency translation (5,568)                   (5,568)  
Net loss (20,648)                     (20,648)
Ending, balance at Dec. 31, 2018 $ 232,642         $ 2 $ 0 $ 118 $ 0 $ 361,311 $ (15,488) $ (113,301)
Ending balance (shares) at Dec. 31, 2018 129,073,591 40,145,617 34,425 88,893,548 1 40,145,617 34,425 88,893,548 1