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Related party disclosures - Transactions (Details) - Beneficial Owner - Immunocare - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Transactions
Invoiced to Immunocore for reimbursements	$ 7	$ 2
Purchases from Immunocore	$ 787	$ 1,149

X

- Definition

Amounts invoiced to related party for reimbursements.

+ References

No definition available.

+ Details

Name:	adap_RelatedPartyTransactionInvoicedToRelatedPartyForReimbursements
Namespace Prefix:	adap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_BeneficialOwnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=adap_ImmunocareLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: