Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Current assets
Cash and cash equivalents	$ 14,208	$ 26,453
Short-term investments	27,919	26,173
Accounts receivable	225	56
Contract asset	0	2
Inventory, net:
Raw materials	1,379	864
Work-in-process	243	136
Finished goods	373	518
Income tax receivable	1	0
Prepaid expenses and other current assets	365	748
Total current assets	44,713	54,950
Property and equipment, net	2,670	1,098
Operating lease assets	262	162
Other assets, net	30	11
Total assets	47,675	56,221
Current liabilities
Accounts payable	546	169
Payroll related accruals	633	816
Accrued expenses and other liabilities	1,170	961
Income tax payable	0	2
Lease liabilities, current	316	234
Total current liabilities	2,665	2,682
Lease liabilities, net of current portion	291	303
Total liabilities	2,956	2,985
Commitments and contingencies (Note 14)
Stockholders’ equity
Convertible preferred stock, $0.001 par value, 2,500,000 shares authorized; 280,898 shares of Series D issued and outstanding at June 30, 2023 and 2022, respectively	0	0
Common stock, $0.001 par value, 250,000,000 shares authorized at June 30, 2023 and 2022 respectively; 1,692,045 and 1,685,595 shares issued at June 30, 2023 and 2022 respectively; 1,681,729 and 1,685,595 outstanding at June 30, 2023 and 2022, respectively	190,643	190,642
Treasury shares, 10,316 shares and no shares at June 30, 2023 and 2022, respectively	(119)	0
Additional paid-in capital	81,002	79,505
Accumulated deficit	(225,354)	(215,712)
Accumulated other comprehensive loss	(1,453)	(1,199)
Total stockholders’ equity	44,719	53,236
Total liabilities and stockholders’ equity	47,675	56,221
Related Party [Member]
Current liabilities
Term note payable - related party	$ 0	$ 500