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Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]          
Net loss before taxes $ (23,253) $ (8,921) $ (52,031) $ (23,380) $ (14,327)
U.K. statutory tax rate (percentage) 19.00%   19.00% 19.50% 20.00%
Income tax benefit at U.K. statutory tax rate $ (4,423)   $ (9,886) $ (4,559) $ (2,865)
Tax incentives / credits (3,234)   (7,296) (3,702) (1,837)
Non-deductible expenses 127   1,553 609 694
Non-deductible expenses 265   (13) 13 57
Operating losses 3,605   7,317 3,754 2,168
Tax on property, plant, equipment and intangibles 140   233 113 0
Other, net 915   812 119 6
Total income tax benefit $ (2,605) $ (1,397) $ (7,280) $ (3,653) $ (1,777)
Effective rate of income tax (percentage) 11.20%   14.00% 15.60% 12.40%