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Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events In February 2014, Servier exercised its exclusive option to develop and commercialize MGD006. Servier will gain exclusive development and commercial rights in all countries outside of the U.S., Canada, Mexico, Japan, South Korea and India. In those countries, the Company will retain development and commercialization rights. As a result of the exercise, the Company received a $15.0 million payment from Servier. In addition, the IND application for MGD006 has cleared the 30-day review period by the FDA, triggering an additional $5.0 million payment to the Company by Servier. In February 2014, the Company completed a follow-on equity offering, in which the Company sold 1.8 million shares of its common stock at a price of $36.50 per share. Additionally, the underwriters of the offering exercised the full amount of their over-allotment option resulting in the sale of an additional 450,000 shares of the Company’s common stock at a price of $36.50 per share. The Company received net proceeds of $76.7 million from this offering, net of underwriting discounts and commissions and other estimated offering expenses.

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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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