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COVER PAGE - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 0-12104    
Entity Registrant Name IMMUNOMEDICS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 61-1009366    
Entity Address, Address Line One 300 The American Road    
Entity Address, City or Town Morris Plains,    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07950    
City Area Code 973    
Local Phone Number 605-8200    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol IMMU    
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 Shell Company false    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 2,660,996,949
Entity Common Stock, Shares Outstanding   213,929,505  
Documents Incorporated by Reference
Specified portions of the registrant’s proxy statement, which will be filed with the Commission pursuant to Regulation 14A within 120 days of the end of the fiscal year ended December 31, 2019 in connection with the registrant’s 2020 Annual Meeting of Stockholders, are incorporated by reference into Part III of this annual report on Form 10-K.
    
Entity Central Index Key 0000722830    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false