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Shareholders’ Equity - Ordinary Shares (Details) - Ordinary shares - $ / shares
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Class of Stock      
Common stock, shares authorized (shares) 200,000,000 200,000,000 37,426,509
Common stock, par value (usd per share) $ 0.000042 $ 0.000042 $ 0.000042