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Stockholders' equity - Schedule of common stock reserved for future issuance (Detail) - shares	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Equity [Abstract]
Common stock warrants outstanding	20,443,496	34,271,146	2,348,039
Common stock options issued and outstanding	4,902,140	1,182,140
Shares available for future issuance under the 2020 Plan	3,302,397	22.397
Shares reserved for common stock under the At the Market Offering	8,000,000	0
Total	36,648,033	35,475,683