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Share Based Compensation - Share Options (Narratives) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award      
Granted (shares) 1,651,740    
Non-employee compensation expense $ 50 $ 100  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award      
Weighted average grant date fair value (usd per share) $ 20.04 $ 8.55 $ 4.04