XML 39 R27.htm IDEA: XBRL DOCUMENT v3.25.1

Organization and Basis of Presentation (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 09, 2025	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Mar. 09, 2024
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Accumulated deficit			$ 742,003		$ 702,022
Cash flows from operations			36,828	$ 36,741
Cash, cash equivalents		$ 130,649	68,610	$ 120,265	105,668
Janssen Pharmaceuticals Inc | Asset Purchase Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Non-refundable upfront cash funding		65,000
Milestone funding					$ 60,000
Milestone funding for extension of RPGR product clinical trials			$ 50,000
Milestone funding for development of drug substances		10,000
Milestone funding for development of drug products		5,000
Milestone funding for sale of drug products in the US		175,000
Milestone funding for sale of drug products in the UK, France, Germany, Spain and Italy		75,000
Milestone funding for transfer of manufacturing technology		25,000
Milestone funding upon regulatory approval		10,000
Hologen Limited | Collaboration Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Class A shares of Hologen received in transaction						250,000
Contingent class A shares receivable of Hologen in transaction						500,000
Hologen Limited | Hologen Strategic Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone funding upfront payment received	$ 200,000
Milestone funding to provide additional capital	$ 230,000
Class A share ownership percentage of Hologen Neuro	30.00%
Class B share ownership percentage of Hologen Neuro	70.00%
Percentage approval of directors	70.00%
Hologen Limited | Manufacturing Framework Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percentage approval of directors	70.00%
Purchase option after twelve months, percentage of Company's outstanding common shares	40.00%
Vesting period, irrevocable option to purchase shares of MeiraGTx Manufacturing	3 years
Maximum | Janssen Pharmaceuticals Inc | Asset Purchase Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contingent Funding Available		$ 350,000
Maximum | Hologen Limited | Hologen Strategic Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone funding to provide additional capital	$ 230,000

X

- Definition

Funding received from the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_AssetPurchaseAgreementFundingReceived
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of ownership in company by share class.

+ References

No definition available.

+ Details

Name:	mgtx_ClassBShareOwnershipPercentageOfHologenNeuro
Namespace Prefix:	mgtx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of ownership in company by share class.

+ References

No definition available.

+ Details

Name:	mgtx_ClassShareOwnershipPercentageOfHologenNeuro
Namespace Prefix:	mgtx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock issued during period in connection with strategic agreement.

+ References

No definition available.

+ Details

Name:	mgtx_ClassSharesOfHologenReceivedInTransaction
Namespace Prefix:	mgtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stock contingently issuable to company in connection with strategic agreement.

+ References

No definition available.

+ Details

Name:	mgtx_ContingentClassSharesReceivableOfHologenInTransaction
Namespace Prefix:	mgtx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Maximum contingent funding available under the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_ContingentFundingAvailable
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received for the completion of certain specified development services for the drug product for the RPGR Product in connection with the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingForDevelopmentOfDrugProducts
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received for the completion of certain specified development services for the drug substance for the RPGR Product in connection with the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingForDevelopmentOfDrugSubstances
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received for the achievement of the initiation of the extension study for the Phase 3 LUMEOS clinical trial for the RPGR Product in connection with the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingForExtensionOfClinicalTrials
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received for the regulatory approval of a Janssen-selected manufacturing facility in each of the United States and European Union for commercial manufacture of the RPGR Product in connection with the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingForRegulatoryApproval
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received for the first commercial sale of an RPGR Product in at least one of the United Kingdom, France, Germany, Spain and Italy in connection with the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingForSaleOfDrugProductsInUkFranceGermanySpainAndItaly
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received for the first commercial sale of an RPGR Product in the United States in connection with the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingForSaleOfDrugProductsInUnitedStates
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received for the transfer of certain manufacturing technology for drug substance and drug product from the Company to Janssen in connection with the Company's asset purchase agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingForTransferOfManufacturingTechnology
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received from the Company's collaboration agreement with Janssen Pharmaceuticals.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingReceived
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received as additional capital of up to fund the development of the Clinical Programs and the Delivery Device

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingToProvideAdditionalCapital
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Milestone funding received in collaboration with Hologen Limited.

+ References

No definition available.

+ Details

Name:	mgtx_MilestoneFundingUpfrontPaymentReceived
Namespace Prefix:	mgtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage approval of directors.

+ References

No definition available.

+ Details

Name:	mgtx_PercentageApprovalOfDirectors
Namespace Prefix:	mgtx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Purchase option after twelve months, percentage of Company's outstanding common shares.

+ References

No definition available.

+ Details

Name:	mgtx_PurchaseOptionAfterTwelveMonthsPercentageOfCompanySOutstandingCommonShares
Namespace Prefix:	mgtx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period over which grantee's right to purchase shares under transaction arrangement is no longer effective, and the company's irrevocable option to repurchase shares becomes effective, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

No definition available.

+ Details

Name:	mgtx_RepurchaseOptionVestingPeriod
Namespace Prefix:	mgtx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-8

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-24

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-4

+ Details

Name:	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-24

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

+ Details

Name:	us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of accumulated undistributed earnings (deficit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480016/944-40-65-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-11

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

+ Details

Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_CounterpartyNameAxis=mgtx_JanssenPharmaceuticalsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mgtx_AssetPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=mgtx_HologenLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mgtx_HologenTransactionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=mgtx_ManufacturingFrameworkAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: