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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Property, Plant and Equipment |  |  |  |  |
Fixed asset impairment |  | $ 0 | $ 4,102,000 | $ 0 | $ 0
Decrease in depreciation expense |  | $ (645,000) | $ (4,611,000) | $ (1,709,000) | $ (1,009,000)
Increase in basic and diluted net loss per ordinary share (usd per share) |  | $ (0.52) | $ (2.88) | $ (1.42) | $ (1.43)
Change in fixed asset assumptions |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |
Decrease in depreciation expense |  |  | $ 300,000 |  |
Increase in basic and diluted net loss per ordinary share (usd per share) |  |  | $ 0.01 |  |
Office equipment |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |
Property, plant and equipment useful life |  |  | 3 years |  |
Lab equipment | Minimum |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |
Property, plant and equipment useful life | 5 years |  | 5 years |  |
Lab equipment | Maximum |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |
Property, plant and equipment useful life | 10 years |  | 10 years |  |
Furniture and fixtures |  |  |  |  |
Property, Plant and Equipment |  |  |  |  |
Property, plant and equipment useful life |  |  | 5 years |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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