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Cover
Sep. 23, 2021
Sep. 16, 2021
May 13, 2021
Cover [Abstract]      
Document Type   8-K  
Document Period End Date Sep. 23, 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