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Leases - Additional Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($)
Lessee, Lease, Description [Line Items] |  |
Operating lease rent expenses | $ 1.2 | $ 1.3
New leases recognized during period | 0 | 0
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Lease term | 1 year 6 months |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Lease term | 191 years |

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- Definition Lease Maturity Term + References No definition available. + Details
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Namespace Prefix: | mgtx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The number new leases recognized during the period. + References No definition available. + Details
Name: | mgtx_OperatingLeaseNumberNewLeasesRecognized
Namespace Prefix: | mgtx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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