Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2021
Current and Future Income Taxes (Textual)
Statutory income tax rate	21.00%	21.00%
Deferred tax assets, Operating loss carryforwards, Not subject to expiration	$ 33,600,000
Percentage of taxable income, limitation on NOLs	80.00%
Investment tax credits expire, description	expire between 2031 and 2042
Current income tax expense	$ 0
Open tax years	2020 2021 2022 2023		2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Represents minimum cumulative percentage of change in ownership as a condition to offset taxable income or tax	50.00%
Cumulative change in ownership period	3 years
United States [Member]
Current and Future Income Taxes (Textual)
Loss before income taxes	$ 6,500,000
Operating loss carryforwards	$ 15,800,000
Operating loss carryforwards expiration date	Jun. 30, 2028
Net operating loss expire, description	begin expiring on June 30, 2028
US and Canadian [Member]
Current and Future Income Taxes (Textual)
Operating loss carryforwards	$ 109,300,000	$ 109,300,000
Canadian [Member]
Current and Future Income Taxes (Textual)
Loss before income taxes	1,800,000
Operating loss carryforwards	$ 59,900,000
Net operating loss expire, description	begin expiring in 2030
Non-refundable federal investment tax credits	$ 421,000	470,000
British Columbia [Member]
Current and Future Income Taxes (Textual)
Investment tax credits expire, description	expire between 2024 and 2032
Non-refundable federal investment tax credits	$ 264,000	299,000
Canadian Scientific Research and Development [Member]
Current and Future Income Taxes (Textual)
Non-refundable federal investment tax credits	$ 3,100,000	$ 3,300,000