CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2019
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Losses accrued on firm purchase commitments	$ 5,000	$ 5,000

Refers to losses accrued on firm purchase commitments.

No definition available.

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