Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023
Current assets
Cash and cash equivalents	$ 10,442	$ 14,208
Short-term investments	21,474	27,919
Accounts receivable	77	225
Inventory, net:
Raw materials	2,038	1,379
Work-in-process	66	243
Finished goods	370	373
Income tax receivable	0	1
Prepaid expenses and other current assets	261	365
Total current assets	34,728	44,713
Property, Plant and Equipment, Net	2,763	2,670
Operating lease assets	119	262
Other assets, net	30	30
Total assets	37,640	47,675
Liabilities, Current [Abstract]
Accounts payable	373	546
Payroll related accruals	1,174	633
Accrued expenses and other liabilities	754	1,170
Operating and Finance Leases, Liability, Current	227	316
Total current liabilities	2,528	2,665
Accrued expenses and other liabilities, net of current portion	232	0
Operating and Finance Leases, Liability, Noncurrent	73	291
Total liabilities	2,833	2,956
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, 2024 and 2023, respectively	0	0
Common stock, $0.001 par value, 250,000,000 shares authorized at June 30, 2024 and 2023 respectively; 1,712,045 and 1,692,045 shares issued at June 30, 2024 and 2023 respectively; 1,701,729 and 1,681,729 outstanding at June 30, 2024 and 2023, respectively	190,643	190,643
Treasury shares, 10,316 shares at June 30, 2024 and 2023	(119)	(119)
Additional paid-in capital	82,480	81,002
Accumulated deficit	(237,020)	(225,354)
Accumulated other comprehensive loss	(1,177)	(1,453)
Total stockholders’ equity	34,807	44,719
Total liabilities and stockholders’ equity	$ 37,640	$ 47,675