Share-based compensation - Summary of Option Activity (Detail) - $ / shares	9 Months Ended	12 Months Ended
Mar. 31, 2023	Jun. 30, 2022
Share-based Payment Arrangement [Abstract]
Number of shares under option plan, Beginning balance	4,599,899
Number of shares under option plan, Granted	555,300
Number of shares under option plan, Exercised	0
Number of shares under option plan, Forfeited	(196,686)
Number of shares under option plan, Ending balance	4,958,513	4,599,899
Number of shares under option plan, Exercisable at March 31, 2023	3,870,316
Number of shares under option plan, Vested and expected to vest at March 31, 2023	4,958,513
Weighted-average exercise price per option, Beginning balance	$ 4.93
Weighted-average exercise price per option, Granted	1.85
Weighted-average exercise price per option, Forfeited	9.77
Weighted-average exercise price per option, Ending balance	4.39	$ 4.93
Weighted-average exercise price per option, Exercisable at March 31, 2023	4.13
Weighted- average exercise price per option Vested and expected to vest at March 31, 2023	$ 4.39
Weighted- Average Remaining Contractual Life (years)	7 years	8 years 1 month 6 days
Weighted- average remaining contractual life Exercisable at March 31, 2023	6 years 4 months 24 days
Weighted- average remaining contractual life Vested and expected to vest at March 31, 2023	7 years

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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