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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities    
Net income (loss) used for calculation of basic and diluted EPS $ 45,129us-gaap_NetIncomeLoss $ (3,108)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation expense 546us-gaap_Depreciation 398us-gaap_Depreciation
Share-based compensation 1,631us-gaap_ShareBasedCompensation 612us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:    
Accounts receivable 1,216us-gaap_IncreaseDecreaseInAccountsReceivable 258us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses 594us-gaap_IncreaseDecreaseInPrepaidExpense (965)us-gaap_IncreaseDecreaseInPrepaidExpense
Other assets 0us-gaap_IncreaseDecreaseInOtherOperatingAssets (1,394)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (225)us-gaap_IncreaseDecreaseInAccountsPayable 1,964us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses (929)us-gaap_IncreaseDecreaseInAccruedLiabilities (848)us-gaap_IncreaseDecreaseInAccruedLiabilities
Lease exit liability (396)us-gaap_IncreaseDecreaseInRestructuringReserve (348)us-gaap_IncreaseDecreaseInRestructuringReserve
Deferred revenue (3,949)us-gaap_IncreaseDecreaseInDeferredRevenue 9,423us-gaap_IncreaseDecreaseInDeferredRevenue
Deferred rent (24)mgnx_IncreaseDecreaseInDeferredRent (106)mgnx_IncreaseDecreaseInDeferredRent
Net cash provided by operating activities 43,593us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 5,886us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities    
Purchases of property and equipment (997)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (447)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (997)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (447)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs 62,692us-gaap_ProceedsFromIssuanceOfCommonStock 76,733us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from stock option exercises 255us-gaap_ProceedsFromStockOptionsExercised 68us-gaap_ProceedsFromStockOptionsExercised
Net cash provided by financing activities 62,947us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 76,801us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net change in cash and cash equivalents 105,543us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 82,240us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 157,591us-gaap_CashAndCashEquivalentsAtCarryingValue 116,481us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 263,134us-gaap_CashAndCashEquivalentsAtCarryingValue $ 198,721us-gaap_CashAndCashEquivalentsAtCarryingValue