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Overview and Basis of Presentation
 9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]  
Overview and Basis of Presentation

1. Overview and Basis of Presentation

MacroGenics, Inc. (the “Company”) was incorporated in Delaware on August 14, 2000. The Company is a clinical-stage biopharmaceutical company focused on discovering and developing innovative monoclonal antibody-based therapeutics for the treatment of cancer and autoimmune diseases. The Company generates its pipeline of product candidates from its proprietary suite of next-generation antibody technology platforms which it believes improve the performance of monoclonal antibodies and antibody-derived molecules. These product candidates, which the Company has identified through its understanding of disease biology and immune-mediated mechanisms, may address disease-specific challenges which are not currently being met by existing therapies. The Company creates both differentiated molecules that are directed to novel cancer targets, as well as “bio-betters” which are drugs designed to improve upon marketed medicines.

The accompanying unaudited interim consolidated financial statements include the accounts of MacroGenics, Inc. and its wholly owned subsidiary, MacroGenics West, Inc. All intercompany accounts and transactions have been eliminated in consolidation. These financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted from this report, as is permitted by such rules and regulations. Accordingly, these consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Prospectus filed with the SEC pursuant to Rule 424(b)(4) on October 11, 2013 (the Prospectus). In the opinion of the Company’s management, the consolidated unaudited interim consolidated financial statements reflect all adjustments necessary to present fairly the results of operations for the three and nine months ended September 30, 2013 and 2012, the Company’s financial position as of September 30, 2013, and the cash flows for the nine months ended September 30, 2013 and 2012. These adjustments are of a normal recurring nature. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of future financial results.

The Company currently operates in one operating segment. Operating segments are defined as components of an enterprise about which separate discrete information is available for the chief operating decision maker, or decision making group, in deciding how to allocate resources and assessing performance. The Company views its operations and manages its business in one segment, which is developing monoclonal antibody-based therapeutics for cancer, autoimmune and infectious diseases.

On October 16, 2013, the Company completed an initial public offering (IPO) of its common stock, which resulted in the sale of 5,750,000 shares, including all additional shares available to cover over-allotments, at a price of $16.00 per share. The Company received net proceeds before expenses from the IPO of $85.6 million after deducting underwriting discounts and commissions paid by the Company.