Commitments and Contingencies (Details)	Sep. 30, 2024
Commitments and Contingencies
Number of new material commitments	0

Number of new material commitments entered into during the period.

No definition available.

Name:	mgtx_NumberOfNewMaterialCommitments
Namespace Prefix:	mgtx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant