Supplementary Statement of Cash Flows Information - Schedule of Supplementary Statement of Cash Flows Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Supplemental Cash Flow Information [Abstract]
Deemed dividend recognized on beneficial conversion features of Series C Preferred stock issuance (note 8)		$ 3,181
Non-cash issue costs (note 8)	$ 683	3,287
Issue costs in accounts payable	43
Conversion of Series B Preferred Stock to common stock (note 8)		4,525
Conversion of Series C Preferred Stock to common stock (note 8)	2,377	3,713
Series B Preferred Stock
Supplemental Cash Flow Information [Abstract]
Preferred Stock common stock dividend (note 8)		17
Preferred Stock Series C
Supplemental Cash Flow Information [Abstract]
Preferred Stock common stock dividend (note 8)	2,462
Deemed dividend recognized on beneficial conversion features of Series C Preferred stock issuance (note 8)		3,181
Conversion of Series C Preferred Stock to common stock (note 8)	$ (2,377)	(3,713)
Series C Warrants
Supplemental Cash Flow Information [Abstract]
Cashless exercise of warrants		$ 79