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Share Based Compensation - Restricted Ordinary Shares (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award        
Share based compensation expense $ 3,393 $ 6,765 $ 3,153 $ 2,257
Non-employee compensation expense $ 50 $ 100    
Restricted Ordinary Shares        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted (shares) 0 0    
Vested (shares) 106,233      
Unrecognized stock based compensation $ 1,100      
Non-employee compensation expense $ 100 $ 1,000 $ 200  
Restricted Ordinary Shares | Service Based        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted (shares)     439  
Restricted Ordinary Shares | Service and Performance Based        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted (shares)     641,711  
Restricted Ordinary Shares | Performance Based        
Share-based Compensation Arrangement by Share-based Payment Award        
Vested (shares)   159,490 24,896  
Share based compensation expense   $ 1,000 $ 800