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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