XML 59 R56.htm IDEA: XBRL DOCUMENT
v2.4.1.9

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 |  |  | $ 41,000,000 mgnx_NonRefundableUpFrontPayment / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember |  |
Milestone payment | 5,000,000 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember | 50,000,000 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember | 0 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember |  |
Recognized revenue under agreement |  |  | $ 400,000 us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember | $ 800,000 us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember | $ 31,200,000 us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_EliLillyMember

X
- Definition Collaboration and license agreement entered date. + References No definition available. + Details
Name: | mgnx_CollaborationAndLicenseAgreementEnteredDate
Namespace Prefix: | mgnx_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | mgnx_LicenseAndCollaborationAgreementsLineItems
Namespace Prefix: | mgnx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Non-refundable up front payment. + References No definition available. + Details
Name: | mgnx_NonRefundableUpFrontPayment
Namespace Prefix: | mgnx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_LicensesRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of consideration recognized during the period for the milestone or milestones. + References 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 + Details
Name: | us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration