XML 18 R1.htm IDEA: XBRL DOCUMENT v3.22.0.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Feb. 22, 2022
Cover [Abstract]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2021  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-36112  
Entity Registrant Name MACROGENICS, INC.  
Entity Incorporation, State or Country Code DE  
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  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
ICFR Auditor Attestation Flag true  
Entity Shell Company false  
Entity Public Float $ 1.6  
Entity Common Stock, Shares Outstanding   61,324,258
Documents Incorporated by Reference Portions of MacroGenics, Inc.'s definitive proxy statement for the 2022 annual meeting of stockholders are incorporated by reference into Part III of this Annual Report.  
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus FY  
Entity Central Index Key 0001125345