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Cover
Sep. 07, 2021
May 13, 2021
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Sep. 07, 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
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol MGNX  
Security Exchange Name NASDAQ  
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  
Amendment Flag false