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Subsequent Events	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	8. Subsequent Event Under the terms of the Servier enoblituzumab agreement described in Note 4 to the financial statements, Servier obtained an option to develop and commercialize enoblituzumab in Europe and other countries. In October 2015, Servier notified the Company that they would not exercise this option, and therefore MacroGenics has now regained worldwide development and commercialization rights to enoblituzumab.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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