Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Sep. 15, 2017
Dec. 31, 2016
Document and Entity Information      
Entity Registrant Name ContraVir Pharmaceuticals, Inc.    
Entity Central Index Key 0001583771    
Document Type 10-K    
Document Period End Date Jun. 30, 2017    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 70.0
Entity Common Stock, Shares Outstanding   78,001,831  
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY