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Selected historical financial information - Consolidated Balance Sheet - Additional Information (Details) - £ / shares	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Selected historical financial information
Common stock, par value	£ 0.001	£ 0.001	£ 0.001

X

- Definition

Selected Historical Financial Information [Abstract]

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

+ Details

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