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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Net loss before taxes | $ (23,253) | $ (139,008) | $ (52,031) | $ (23,380)
U.K. statutory tax rate (percentage) | 19.00% | 19.00% | 19.00% | 19.50%
Income tax benefit at U.K. statutory tax rate | $ (4,423) | $ (26,411) | $ (9,886) | $ (4,559)
Tax incentives / credits | (3,234) | (16,312) | (7,296) | (3,702)
Non-deductible expenses | 127 | 4,048 | 1,553 | 609
Adjustments in respect of prior years | 265 | 96 | (13) | 13
Operating losses | 3,605 | 21,643 | 7,317 | 3,754
Tax on property, plant, equipment and intangibles | 140 | 267 | 233 | 113
Other, net | 915 | 1,510 | 812 | 119
Total income tax benefit | (2,605) | (15,159) | (7,280) | (3,653)
Current income tax benefit | (2,605) | (14,749) | (7,280) | (3,653)
Deferred income tax benefit | $ 0 | $ (410) | $ 0 | $ 0
Effective rate of income tax (percentage) | 11.20% | 10.90% | 14.00% | 15.60%

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