Stockholders' equity - Ordinary Shares (Details) |
6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Dec. 31, 2015
shares
|
Dec. 31, 2016
GBP (£)
shares
|
Jun. 30, 2015
shares
|
Jun. 30, 2014
shares
|
|
| Stockholders' equity | ||||
| Number of votes per share on a show of hands | 1 | |||
| Number of votes per share on a poll | 1 | |||
| Maximum aggregate nominal amount | £ 150,000 | |||
| Issuance of shares upon exercise of stock options (in shares) | shares | 0 | 63,192 | 0 | 2,265,000 |
| Remaining authority to allot new shares amount | £ 149,937 | |||
| X | ||||||||||
- Definition Maximum aggregate nominal amount directors have the authority to allot new shares or to grant rights. No definition available.
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| X | ||||||||||
- Definition Number of votes per share on a poll. No definition available.
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| X | ||||||||||
- Definition Number of votes per share on a show of hands. No definition available.
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| X | ||||||||||
- Definition Remaining nominal amount directors have the authority to allot new shares or to grant rights. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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