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Collaboration and License Agreements - Additional Information 6 (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2010 | Dec. 31, 2014 | Dec. 31, 2013
License And Collaboration Agreements [Line Items] |  |  |
Deferred revenue, Current |  | $ 14,248,000 us-gaap_DeferredRevenueCurrent | $ 20,267,000 us-gaap_DeferredRevenueCurrent
Deferred revenue, Long-term liabilities |  | 16,472,000 us-gaap_DeferredRevenueNoncurrent | 7,136,000 us-gaap_DeferredRevenueNoncurrent
Green Cross [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
Collaboration agreement date |  | June 2010 |
Term of the agreement |  | 2020-06 |
Nonrefundable upfront payment | 1,000,000 mgnx_NonRefundableUpFrontPayment / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember |  |
Adjustment to revenue from contract material modification |  | 1,300,000 mgnx_AdjustmentToRevenueUnderAccountingStandardsCodification / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember |
Recognized revenue under agreement |  | 1,700,000 us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember | 100,000.0 us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember
Milestones achieved |  | 0 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember | 0 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember
Deferred revenue |  |  | 650,000 us-gaap_DeferredRevenue / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember
Unbilled receivable balance |  | 525,000 us-gaap_UnbilledContractsReceivable / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember |
Deferred revenue, Current |  |  | 100,000 us-gaap_DeferredRevenueCurrent / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember
Deferred revenue, Long-term liabilities |  |  | 550,000 us-gaap_DeferredRevenueNoncurrent / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember
Green Cross [Member] | Maximum [Member] |  |  |
License And Collaboration Agreements [Line Items] |  |  |
Aggregate potential future cost reimbursement |  | 5,500,000 mgnx_AggregatePotentialFutureCostReimbursement / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Clinical and commercial milestone payments |  | $ 2,500,000 mgnx_AdditionalPotentialClinicalAndCommercialMilestonePaymentsUnderAgreement / us-gaap_CounterpartyNameAxis = mgnx_GreenCrossCorporationMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition Aggregate potential clinical and commercial milestone payments available to be earned under collaboration agreement. + References No definition available. + Details
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- Definition Adjustment To Revenue Under Accounting Standards Codification + References No definition available. + Details
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- Definition Collaboration and license agreement entered date. + References No definition available. + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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- Definition The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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- Definition The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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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)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- 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
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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(3) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55302-109406 + Details
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