Supplementary Statement of Cash Flows Information - Schedule of Supplementary Statement of Cash Flows Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Supplemental Cash Flow Information [Abstract]
Non-cash issue costs (note 6)	$ 289	$ 683
Issue costs in accounts payable		43
Equipment additions reclassified from prepaid expenses	447
Conversion of Series C Preferred Stock to common stock (note 6)		2,377
Preferred Stock Series C
Supplemental Cash Flow Information [Abstract]
Preferred Stock common stock dividend (note 6)	362	2,462
Conversion of Series C Preferred Stock to common stock (note 6)	$ (1,909)	$ (2,377)