Adaptimmune Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Reclassifications - General Information (Details) - Restatement Adjustment - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2014
Reclassification of property and insurance costs relating to research and development facilities \| Research and development
Operating expenses
Property and insurance costs	$ 1,377	$ 1,162
Reclassification of property and insurance costs relating to research and development facilities \| General and administrative
Operating expenses
Property and insurance costs	(1,377)	(1,162)
Reclassification of legal expenses relating to patents \| Research and development
Operating expenses
Legal expenses related to patents	(149)	(303)	$ (171)
Reclassification of legal expenses relating to patents \| General and administrative
Operating expenses
Legal expenses related to patents	$ 149	$ 303	$ 171