Stockholders' equity - Convertible Preferred Shares (Details) $ in Thousands |
1 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|
Mar. 20, 2015 |
Feb. 23, 2015 |
May 31, 2015 |
Sep. 30, 2014
USD ($)
shares
|
Dec. 31, 2017
USD ($)
|
Jun. 30, 2015
USD ($)
|
|
| Convertible preferred shares | ||||||
| Net consideration | $ 103,167 | |||||
| Share exchange ratio | 0.01 | 0.01 | ||||
| Series A Preferred Shares | ||||||
| Convertible preferred shares | ||||||
| Sale of stock (in shares) | shares | 1,758,418 | |||||
| Net consideration | $ 98,872 | $ 98,872 | ||||
| Stock issuance costs | $ 4,949 | |||||
| Conversion ratio, initial rate | 1 | |||||
| Conversion ratio, third anniversary of the issuance | 2 | |||||
| Conversion ratio, initial public offering | 1 | |||||
| Conversion ratio, initial public offering, third anniversary | 2 | |||||
| Conversion ratio | 1 | |||||
| X | ||||||||||
- Definition Ratio of the number of ordinary shares issued for each preferred share upon conversion applied to the conversion of preferred shares into ordinary shares. No definition available.
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| X | ||||||||||
- Definition The ratio of the number of ordinary shares issued for each preferred share upon conversion applied to the conversion of preferred shares into ordinary shares upon an initial public offering occurring prior to the first anniversary of the issuance. No definition available.
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- Definition The ratio of the number of ordinary shares issued for each preferred share upon conversion applied to the conversion of preferred shares into ordinary shares upon an initial public offering occurring after the third anniversary of the issuance No definition available.
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| X | ||||||||||
- Definition The initial ratio of the number of ordinary shares issued for each preferred share upon conversion applied to the conversion of preferred shares into ordinary shares. No definition available.
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| X | ||||||||||
- Definition The ratio of the number of ordinary shares issued for each preferred share upon conversion applied to the conversion of preferred shares into ordinary shares on the third anniversary of the issuance. No definition available.
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| X | ||||||||||
- Definition Stock issuance costs incurred during the period. No definition available.
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| X | ||||||||||
- Definition The ratio applied to the share-for-share exchange whereby shareholders holding preferred and ordinary shares of Adaptimmune Limited exchange them for preferred and ordinary shares of Adaptimmune Therapeutics Limited. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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