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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Deferred tax assets: |  |  |
Other differences | $ 2,870 | $ 1,785 | $ 11
Tax losses | 7,851 | 6,515 | 3,878
Fixed assets | 621 | 1,740 | 1,098
Total deferred tax assets | 11,342 | 10,040 | 4,987
Valuation allowances | (11,342) | (10,040) | (4,987)
Net deferred tax asset (liability) | $ 0 | $ 0 | $ 0

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