Accrued expenses and other current liabilities - Supply agreement (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Contingencies and commitments
Period of purchase obligation	5 years
Minimum \| Research and development
Contingencies and commitments
Purchasing obligations	$ 2.5

Term of the recorded purchase obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days

No definition available.

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