Stockholders' Equity - Schedule of Warrants (Detail) - Common Stock Warrants [Member]	6 Months Ended
	Dec. 31, 2020 $ / shares shares
Balance – June 30, 2020 | shares	10,309,000
Issuance of Adgero Warrants | shares	2,314,000
Exercise of warrants | shares	(1,180,000)	[1]
Warrants issued for services | shares	380,000	[2]
Expiry of warrants | shares	(113,000)	[3]
Balance – December 31, 2020 | shares	11,710,000
Beginning balance | $ / shares	$ 2.71
Issuance of Adgero Warrants | $ / shares	3.18
Stock option exercise price | $ / shares	1.00	[1]
Warrants issued for services | $ / shares	1.53	[2]
Expired | $ / shares	30.00	[3]
Ending balance | $ / shares	$ 2.67

[1] A total of 1,179,707 2020 Investor Warrants were exercised at $1.00 per share.

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

[3] The warrant expiries include the 2015 Investor Warrants, the 2015 Agent Warrants, and certain warrants issued for services. All of the expired warrants were exercisable at $30 per share.