Benitec Biopharma Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stockholders' equity - Additional information (Detail)

Stockholders' equity - Additional information (Detail)							1 Months Ended	9 Months Ended	12 Months Ended
Stockholders' equity - Additional information (Detail)	Aug. 11, 2023 $ / shares shares	Oct. 27, 2022 $ / shares shares	Oct. 17, 2022 shares	Sep. 15, 2022 $ / shares shares	Dec. 09, 2020	Apr. 22, 2020 shares	Aug. 31, 2023 $ / shares	Mar. 31, 2023 USD ($)	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2021 USD ($)	Aug. 15, 2023 shares	Dec. 08, 2021 shares	Dec. 06, 2019 shares $ / shares
Class of warrant or right, exercise price of warrants or rights \| $ / shares				$ 11.22					$ 11.22
Unrecognised share based compensation expense \| $									$ 350,000	$ 522,000
Warrants outstanding									2,348,039	6,300
Employee option awards related stock based compensation expense \| $								$ 34,000		$ 34,000	$ 34,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares									$ 3.34	$ 44.2
Subsequent Event [Member]
Sale of stock issue price per share \| $ / shares	$ 1.9299
Two Thousand And Twenty Equity Incentive Plan [Member]
Common stock shares reserved for future issuance													1,850,000
Two Thousand And Twenty Equity Incentive Plan [Member] \| Employee stock option [Member]
Share based compensation by share based award unrecognized expense remaining period of recognition									2 years 1 month 9 days
Share based compensation by share based award contractual term					10 years
Common Stock [Member]
Warrants convertible into shares of common stock on exercise						6,300
Cashless exercise of purchase warrants (In shares)						2,201
Common Stock [Member] \| Subsequent Event [Member]
Warrants convertible into shares of common stock on exercise	2,331,606											458,134
Purchase warrants [Member]
Class of warrant or right, exercise price of warrants or rights \| $ / shares														$ 178.5
Warrants convertible into shares of common stock on exercise														12,600
Number of series of warrants issued														4
Expiry date of warrants														Dec. 06, 2024
Series 2 Warrants [Member] \| Subsequent Event [Member] \| Revision In The Exercise Price Of Prefunded Warrants [Member]
Class of warrants or rights weighted average exercise price of class of warrants or rights issued during the period \| $ / shares							$ 1.9299
Pre-funded warrants [Member]
Class Of Warrants Or Rights Excercised During The Period		9,804	117,939
Pre-funded warrants [Member] \| Subsequent Event [Member]
Sale of stock number of shares issued in the transaction	15,126,226
Sale of stock issue price per share \| $ / shares	$ 1.9298
IPO [Member]
Sale of stock number of shares issued in the transaction				1,037,521
Sale of stock issue price per share \| $ / shares	$ 1.9299			$ 10.03
Issue of common stock and warrant price per share	1.93%			10.20%
Class of warrants or rights issue price per unit \| $ / shares	$ 0.0001			$ 0.17
IPO [Member] \| Subsequent Event [Member]
Sale of stock number of shares issued in the transaction	875,949
Sale of stock issue price per share \| $ / shares	$ 0.0001
Warrants convertible into shares of common stock on exercise	16,002,175
Class of warrant or rights issued during period	16,002,175
IPO [Member] \| Series 2 Warrants [Member]
Warrants convertible into shares of common stock on exercise				1,753,503					1,753,503
Warrants outstanding				29,809,471					29,809,471
IPO [Member] \| Series 2 Warrants [Member] \| Subsequent Event [Member]
Class of warrant or right, exercise price of warrants or rights \| $ / shares	$ 1.9299
IPO [Member] \| Pre-funded warrants [Member]
Class of warrant or right, exercise price of warrants or rights \| $ / shares				$ 0.0017
Class of warrant or rights issued during period				715,978
IPO [Member] \| Pre-funded warrants [Member] \| Subsequent Event [Member]
Warrants convertible into shares of common stock on exercise	15,126,226
Class of warrant or rights issued during period	15,126,226
Pre-funded warrants [Member]
Sale of stock number of shares issued in the transaction									715,979
Class of warrant or right, exercise price of warrants or rights \| $ / shares		$ 0.0017