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Consolidated Statements of Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data | Total | Series A-1 Convertible Preferred Stock [Member] | Series A-2 Convertible Preferred Stock [Member] | Series B Convertible Preferred Stock [Member] | Series C Convertible Preferred Stock [Member] | Series D-1 Convertible Preferred Stock [Member] | Series D-2 Convertible Preferred Stock [Member] | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member]
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Beginning Balance at Dec. 31, 2011 | $ (17,484)us-gaap_StockholdersEquity | $ 269 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA1ConvertiblePreferredStockMember | $ 74 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA2ConvertiblePreferredStockMember | $ 714 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesBConvertiblePreferredStockMember | $ 1,110 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesCConvertiblePreferredStockMember | $ 144 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD1ConvertiblePreferredStockMember | $ 637 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD2ConvertiblePreferredStockMember | $ 10 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (58)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 163,450 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (183,834)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Beginning Balance, Shares at Dec. 31, 2011 |  | 26,874,792 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA1ConvertiblePreferredStockMember | 7,364,582 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA2ConvertiblePreferredStockMember | 71,401,237 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesBConvertiblePreferredStockMember | 110,952,217 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesCConvertiblePreferredStockMember | 14,446,227 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD1ConvertiblePreferredStockMember | 63,681,176 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD2ConvertiblePreferredStockMember | 1,049,030 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,381 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Share-based compensation | 838 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  | 838 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Stock option exercises | 46 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  |  |  | 46 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Stock option exercises, Shares | 863,176 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  | 49,884 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net income (loss) | 8,362 us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | 8,362 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2012 | (8,238)us-gaap_StockholdersEquity | 269 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA1ConvertiblePreferredStockMember | 74 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA2ConvertiblePreferredStockMember | 714 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesBConvertiblePreferredStockMember | 1,110 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesCConvertiblePreferredStockMember | 144 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD1ConvertiblePreferredStockMember | 637 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD2ConvertiblePreferredStockMember | 10 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (58)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 164,334 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (175,472)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, Shares at Dec. 31, 2012 |  | 26,874,792 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA1ConvertiblePreferredStockMember | 7,364,582 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA2ConvertiblePreferredStockMember | 71,401,237 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesBConvertiblePreferredStockMember | 110,952,217 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesCConvertiblePreferredStockMember | 14,446,227 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD1ConvertiblePreferredStockMember | 63,681,176 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD2ConvertiblePreferredStockMember | 1,098,914 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,381 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Share-based compensation | 862 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  | 862 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Issuance of common stock, net of offering costs | 83,623 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  | 58 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 83,565 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Issuance of common stock, net of offering costs, Shares |  |  |  |  |  |  |  | 5,750,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Conversion of preferred stock to common stock | 1,860 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities | (269)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA1ConvertiblePreferredStockMember | (74)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA2ConvertiblePreferredStockMember | (714)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesBConvertiblePreferredStockMember | (1,110)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesCConvertiblePreferredStockMember | (144)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD1ConvertiblePreferredStockMember | (637)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD2ConvertiblePreferredStockMember | 171 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 4,637 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Conversion of preferred stock to common stock, Shares |  | (26,874,792)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA1ConvertiblePreferredStockMember | (7,364,582)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesA2ConvertiblePreferredStockMember | (71,401,237)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesBConvertiblePreferredStockMember | (110,952,217)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesCConvertiblePreferredStockMember | (14,446,227)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD1ConvertiblePreferredStockMember | (63,681,176)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = mgnx_SeriesD2ConvertiblePreferredStockMember | 17,060,634 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock option exercises | 1,068 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  |  |  |  | 13 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 1,055 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Stock option exercises, Shares | 1,268,049 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  | 1,268,049 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net income (loss) | (261)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | (261)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2013 | 78,914 us-gaap_StockholdersEquity |  |  |  |  |  |  | 252 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (58)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 254,453 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (175,733)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, Shares at Dec. 31, 2013 |  |  |  |  |  |  |  | 25,177,597 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 14,381 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Share-based compensation | 3,244 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |  |  |  |  |  |  |  | 3,244 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Issuance of common stock, net of offering costs | 76,716 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  | 22 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 76,694 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Issuance of common stock, net of offering costs, Shares |  |  |  |  |  |  |  | 2,250,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock plan related activity, value of shares issued | 725 mgnx_StockIssuedDuringPeriodValueStockPlanActivity |  |  |  |  |  |  | 6 mgnx_StockIssuedDuringPeriodValueStockPlanActivity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (19)mgnx_StockIssuedDuringPeriodValueStockPlanActivity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 738 mgnx_StockIssuedDuringPeriodValueStockPlanActivity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Stock plan related activity, shares issued |  |  |  |  |  |  |  | 568,041 mgnx_StockIssuedDuringPeriodSharesStockPlanActivity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 865 mgnx_StockIssuedDuringPeriodSharesStockPlanActivity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Retirement of treasury stock |  |  |  |  |  |  |  |  | 58 us-gaap_TreasuryStockRetiredParValueMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (58)us-gaap_TreasuryStockRetiredParValueMethodAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Stock option exercises, Shares | 568,906 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |  |  |  |
Retirement of treasury stock, Shares |  |  |  |  |  |  |  |  | (14,381)us-gaap_TreasuryStockSharesRetired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Net income (loss) | (38,313)us-gaap_NetIncomeLoss |  |  |  |  |  |  |  |  |  | (38,313)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance at Dec. 31, 2014 | $ 121,286 us-gaap_StockholdersEquity |  |  |  |  |  |  | $ 280 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (19)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 335,071 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (214,046)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Ending Balance, Shares at Dec. 31, 2014 |  |  |  |  |  |  |  | 27,995,638 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 865 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |

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