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Subsequent Events (Details) - Incyte Corporation (Incyte) - Incyte MGA012 Agreement - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2022	Mar. 31, 2018
Subsequent Event [Line Items]
Non-refundable upfront payment		$ 150.0
Revenues From License Agreements | Forecast
Subsequent Event [Line Items]
Non-refundable upfront payment	$ 10.0

X

- Definition

Initial fee received from collaboration or license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	mgnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis=mgnx_IncyteMGA012AgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=mgnx_RevenuesFromLicenseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: