Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenue	$ 35	$ 97	$ 336	$ 845
Cost of revenue	24	46	211	662
Gross profit	11	51	125	183
Operating expenses:
Selling, general and administrative	1,406	1,476	4,606	4,630
Research and development	1,355	722	3,847	2,013
Total operating expenses	2,761	2,198	8,453	6,643
Loss from operations	(2,750)	(2,147)	(8,328)	(6,460)
Other income and expense, net	375	47	1,006	151
Loss from operations before income taxes	(2,375)	(2,100)	(7,322)	(6,309)
Income tax benefit	0	0	0	0
Net loss	$ (2,375)	$ (2,100)	$ (7,322)	$ (6,309)
Weighted average common shares outstanding:
Basic and diluted (in shares)	1,616	1,587	1,614	1,584
Basic and diluted net loss per common share:
Net loss per common share (in dollars per share)	$ (1.47)	$ (1.32)	$ (4.54)	$ (3.98)
Other comprehensive loss, net of tax:
Net loss	$ (2,375)	$ (2,100)	$ (7,322)	$ (6,309)
Available-for-sale securities:
Net unrealized gain/(losses)	181	(524)	(189)	(769)
Total comprehensive loss	$ (2,194)	$ (2,624)	$ (7,511)	$ (7,078)