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Shareholders’ Equity - Ordinary Shares (Details) - Ordinary shares - $ / shares | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
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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

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