Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Current assets
Cash and cash equivalents	$ 28,346	$ 35,936
Short-term investments	26,580	27,351
Accounts receivable	140	5
Inventory, net:
Raw materials	1,140	1,056
Work-in-process	17	147
Finished goods	341	297
Prepaid expenses and other current assets	579	318
Total current assets	57,143	65,110
Property and equipment, net	917	263
Operating lease assets	184	249
Other assets	11	11
Total assets	58,255	65,633
Current liabilities
Accounts payable	107	396
Payroll related accruals	899	344
Accrued expenses and other liabilities	859	888
Income tax payable	2	2
Term note payable - related party	500	2,500
Lease liabilities, current	231	81
Total current liabilities	2,598	4,211
Lease liabilities, net of current portion	362	215
Total liabilities	2,960	4,426
Commitments and contingencies (Note 13)
Stockholders’ equity
Convertible preferred stock, $0.001 par value, 2,500,000 shares authorized; 280,898 shares of Series D issued and outstanding at March 31, 2022 and June 30, 2021	0	0
Common stock, $0.001 par value, 250,000,000 and 50,000,000 shares authorized at March 31, 2022 and June 30, 2021, respectively; 49,569,113 and 49,450,558 shares issued and outstanding at March 31, 2022 and June 30, 2021, respectively	190,641	190,641
Additional paid-in capital	79,137	77,971
Accumulated deficit	(213,691)	(207,382)
Accumulated other comprehensive loss	(792)	(23)
Total stockholders’ equity	55,295	61,207
Total liabilities and stockholders’ equity	$ 58,255	$ 65,633