Licensing arrangements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Product development and regulatory approval milestone payments	$ 2,600,000
Commercial milestone payments	1,500,000
2021 Patent License Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Product development and regulatory approval milestone payments				$ 1,500,000
Commercial milestone payments				$ 700,000
License fee payment	$ 100,000
2021 Patent License Agreement | Forecast
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Annual minimum payments		$ 30,000	$ 20,000