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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%

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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible depreciation and amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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