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Document and Entity Information
Apr. 29, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 29, 2021
Entity Registrant Name MACROGENICS INC
Entity Incorporation, State or Country Code DE
Entity File Number 001-36112
Entity Tax Identification Number 06-1591613
Entity Address, Address Line One 9704 Medical Center Drive
Entity Address, City or Town Rockville
Entity Address, State or Province MD
Entity Address, Postal Zip Code 20850
City Area Code 301
Local Phone Number 251-5172
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001125345
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol MGNX
Security Exchange Name NASDAQ