Capital Stock - Summary of Warrants Exercisable into Common Stock (Details) - Warrants - $ / shares	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Class Of Warrant Or Right [Line Items]
Warrants, Outstanding, Beginning Balance	1,200,000	1,200,000
Warrants, Expired	(1,200,000)
Warrants, Outstanding, Ending Balance		1,200,000	1,200,000
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 1.40	$ 1.40
Weighted Average Exercise Price, Expired	$ 1.40
Weighted Average Exercise Price, Outstanding, Ending Balance		$ 1.40	$ 1.40
Weighted-Average Remaining Contractual Term (Years), Outstanding	0 years	10 days	1 year 10 days