Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Revenue	$ 263	$ 561	$ 301	$ 748
Cost of revenue	155	441	187	616
Gross profit	108	120	114	132
Operating expenses:
Selling, general and administrative	1,558	1,728	3,200	3,154
Research and development	1,364	652	2,492	1,291
Total operating expenses	2,922	2,380	5,692	4,445
Loss from operations	(2,814)	(2,260)	(5,578)	(4,313)
Other income and expense, net	396	80	631	104
Loss from operations before income taxes	(2,418)	(2,180)	(4,947)	(4,209)
Income tax benefit	0	0	0	0
Net loss	$ (2,418)	$ (2,180)	$ (4,947)	$ (4,209)
Weighted average common shares outstanding:
Basic and diluted (in shares)	1,613	1,583	1,613	1,582
Basic and diluted net loss per common share:
Net loss per common share (in dollars per share)	$ (1.50)	$ (1.38)	$ (3.07)	$ (2.66)
Other comprehensive loss, net of tax:
Net loss	$ (2,418)	$ (2,180)	$ (4,947)	$ (4,209)
Available-for-sale securities:
Net unrealized losses, net of zero tax expense	(2)	(197)	(370)	(245)
Total comprehensive loss	$ (2,420)	$ (2,377)	$ (5,317)	$ (4,454)