Stockholders' Equity - Schedule of Warrants (Detail) - $ / shares		12 Months Ended
		Jun. 30, 2022		Jun. 30, 2021
Issuance of 2022 April Agent Warrants		$ 0.6625
Warrant [Member]
Balance - June 30, 2020		6,974,000		10,309,000
Underwritten public offering				2,314,000
Exercise of PFW		4,800,000
Exercise of 2020 Investor Warrants		(69,000)
Warrants issued for services	[1]			600,000
Ending balance		36,024,000		6,974,000
Issuance of 2022 Investor Warrants		12,000,000
Issuance of 2022 Investor Warrants		$ 1.25
Issuance of 2022 Agent Warrants		$ 1.5625
Issuance Of 2022 April Investor Warrants		16,226,000
Issuance of 2022 April Investor Warrants		$ 0.41
Issuance of 2022 April Agent Warrants		1,623,000
Issuance of PFW		4,800,000
Issuance of PFW		$ 0.001
Issuance of 2022 Agent Warrants		600,000
Exercise of warrants	[2]			4,907,000
Expiry of warrants		(1,330,000)	[3]	1,342,000
Beginning balance		$ 3.34		$ 2.71
Underwritten public offering				3.18
Exercise of PFW		0.001
Stock option exercise price		1.00		1.00	[2]
Warrants issued for services	[1]			1.74
Expired		8.55	[3]	6.00
Ending balance		$ 0.99		$ 3.34

[1] Warrants issued for services are exercisable at various prices and expire at the various dates noted in the table below.

[2] A total of 4,404 2020 Investor Warrants were exercised at $1.00 per share and 503 warrants issued as either agent warrants or issued for services were exercised on a cashless basis for which 273 common shares were issued.

[3] Expired warrants include: 1,108 Adgero replacement warrants with an exercise price of $3.18, 208 2017 Investor Warrants with an exercise price of $35.00, and 14 2017 Agent Warrants with an exercise price of $40.60.