Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
12 Months Ended
Jun. 30, 2021
Sep. 07, 2021
Dec. 31, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-39267    
Entity Registrant Name Benitec Biopharma Inc.    
Entity Tax Identification Number 84-4620206    
Document Period End Date Jun. 30, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001808898    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 3940 Trust Way    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94545    
City Area Code (510)    
Local Phone Number 780-0819    
Title of 12(b) Security Common Stock    
Trading Symbol BNTC    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   8,171,690  
Entity Public Float     $ 13,621,407
Entity Address, City or Town Hayward