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Summary of Significant Accounting Policies - Short-term Deposits (Details)	3 Months Ended
	Mar. 31, 2016
Short-term deposits
Maturity term, minimum (in months)	3 months
Maturity term, maximum (in months)	12 months

X

- Definition

Maximum maturity term of short-term bank deposits.

+ References

No definition available.

+ Details

Name:	adap_ShortTermBankDepositsMaturityTermMaximum
Namespace Prefix:	adap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum maturity term of short-term bank deposits.

+ References

No definition available.

+ Details

Name:	adap_ShortTermBankDepositsMaturityTermMinimum
Namespace Prefix:	adap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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