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Shareholders’ Equity - Ordinary Shares (Details) - Ordinary shares	Sep. 30, 2018 $ / shares shares	Jun. 22, 2018 £ / shares	Jun. 22, 2018 $ / shares	Sep. 30, 2017 $ / shares shares
Class of Stock
Common stock, shares authorized (shares)	200,000,000			37,426,509
Common stock, par value (usd per share) | (per share)	$ 0.000042	£ 0.000032	$ 0.000042	$ 0.000042

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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