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Share based compensation - Options Granted to Nonemployees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share based compensation
Number of options granted (in shares)	13,575,554	9,183,962
Nonemployees
Share based compensation
Number of options granted (in shares)	3,074,600
Share based payment charge (benefit)	$ (108)	$ 528

X

- Definition

Represents the expense (benefit) recognized during the period arising from equity-based compensation arrangements with nonemployees.

+ References

No definition available.

+ Details

Name:	adap_AllocatedShareBasedCompensationExpenseBenefitNonemployees
Namespace Prefix:	adap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalGeneralDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=adap_NonEmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: