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Collaboration and License Agreements - Additional Information 7 (Detail) (Eli Lilly [Member], USD $)	1 Months Ended		12 Months Ended
	May 31, 2010	May 31, 2008	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Eli Lilly [Member]
License And Collaboration Agreements [Line Items]
Collaboration agreement date			October 2007
Nonrefundable upfront payment			$ 41,000,000mgnx_NonRefundableUpFrontPayment / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember
Milestone payment	5,000,000us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember	50,000,000us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember	0us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember
Recognized revenue under agreement			$ 400,000us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember	$ 800,000us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember	$ 31,200,000us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember

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Collaboration and license agreement entered date.

+ References

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- Definition

Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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The amount of consideration recognized during the period for the milestone or milestones.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 28

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=19771982&loc=SL6892177-166501

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