Benitec Biopharma Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity - Additional information (Detail)

Stockholders' equity - Additional information (Detail) $ / shares in Units, $ in Millions											3 Months Ended	9 Months Ended
	Mar. 18, 2024 $ / shares shares	Mar. 15, 2024 $ / shares shares	Nov. 24, 2023 $ / shares shares	Oct. 17, 2023 $ / shares shares	Aug. 11, 2023 USD ($) $ / shares shares	Oct. 27, 2022 $ / shares shares	Oct. 17, 2022 shares	Sep. 15, 2022 $ / shares shares	Dec. 09, 2020	Apr. 22, 2020 shares	Sep. 30, 2023 shares	Mar. 31, 2024 USD ($) shares	Jun. 30, 2023 shares	Dec. 07, 2022 shares	Dec. 08, 2021 shares	Dec. 06, 2019 shares $ / shares
Sale of stock issue price per share \| $ / shares					$ 1.9299
Class of warrant or right, exercise price of warrants or rights \| $ / shares								$ 11.22
Net proceeds from public offering \| $					$ 27.9
Unrecognised share based compensation expense \| $												$ 4.7
Common Stock Shares Authorized												160,000,000	160,000,000
Warrants outstanding											33,476,440	33,299,080	2,348,039
Two Thousand And Twenty Equity Incentive Plan [Member]
Common stock shares reserved for future issuance															1,204,537
Two Thousand And Twenty Equity Incentive Plan [Member] \| Employee Stock Option
Share based compensation by share based award unrecognized expense remaining period of recognition												2 years 10 months 24 days
Share based compensation by share based award contractual term									10 years
Maximum [Member]
Common Stock Shares Authorized														160,000,000	40,000,000
Minimum [Member]
Common Stock Shares Authorized														40,000,000	10,000,000
Common Stock [Member]
Warrants convertible into shares of common stock on exercise					2,331,606					6,300		458,134
Cashless exercise of purchase warrants (In shares)										2,201
Common Warrants [Member]
Class of warrant or right, exercise price of warrants or rights \| $ / shares					$ 3.86
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]
Class of warrant or right, exercise price of warrants or rights \| $ / shares			$ 1.93
Class Of Warrants Or Rights Excercised During The Period			20,000
Pre-funded warrants [Member]
Sale of stock number of shares issued in the transaction					15,126,226
Sale of stock issue price per share \| $ / shares					$ 1.9298
Class of warrant or right, exercise price of warrants or rights \| $ / shares				$ 0.0001	$ 0.0001
Class Of Warrants Or Rights Excercised During The Period				25,000		9,804	117,939
IPO [Member]
Sale of stock number of shares issued in the transaction					875,949			1,037,520
Sale of stock issue price per share \| $ / shares					$ 1.9299			$ 10.03
Warrants convertible into shares of common stock on exercise					16,002,175
Class of warrant or rights issued during period					16,002,175
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] \| Series 2 Warrants [Member]
Class of warrant or right, exercise price of warrants or rights \| $ / shares					$ 1.9299
Warrants convertible into shares of common stock on exercise								1,753,503
Warrants outstanding								29,809,471
IPO [Member] \| Pre-funded warrants [Member]
Class of warrant or right, exercise price of warrants or rights \| $ / shares								$ 0.0017
Warrants convertible into shares of common stock on exercise					15,126,226			715,979
Class of warrant or rights issued during period					15,126,226			12,171,628
Pre-funded warrants [Member]
Sale of stock number of shares issued in the transaction											15,126,226
Class of warrant or right, exercise price of warrants or rights \| $ / shares	$ 0.0001	$ 0.0001				$ 0.0017
Class Of Warrants Or Rights Excercised During The Period	26,472	105,888