Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 17,342	$ 19,497
Accounts receivable, net of allowance for doubtful accounts of $43 at September 30, 2022 and $6 at December 31, 2021	1,554	1,393
Inventories	5,047	4,601
Prepaid expenses and other current assets	652	300
Total current assets	24,595	25,791
Right of use asset	2,449	3,179
Property and equipment, net	574	95
Other assets	333	420
Total assets	27,951	29,485
Current liabilities:
Accounts payable	612	1,394
Accrued compensation	1,344	1,609
Series A preferred stock dividends payable	3,382	0
Accrued expenses and other current liabilities	669	718
Leasehold liability, current portion	1,065	985
Total current liabilities	7,072	4,706
Borrowings, long-term portion	13,668	12,287
Leasehold liability, long-term portion	1,384	2,194
Other long-term liabilities	881	575
Total liabilities	23,005	19,762
Commitments and contingencies (Note 6)
Stockholders’ equity:
Convertible preferred stock issuable in series, par value of $0.001; Shares authorized: 5,000,000 at September 30, 2022 and December 31, 2021; Shares issued and outstanding: 56,451 at September 30, 2022 and December 31, 2021; aggregate liquidation preference of $56,366 at September 30, 2022 and December 31, 2021	0	0
Common stock, par value of $0.001; Shares authorized: 100,000,000 at September 30, 2022 and December 31, 2021; Shares issued and outstanding: 7,435,644 and 4,778,263 at September 30, 2022 and December 31, 2021, respectively	7	96
Additional paid-in capital	403,133	394,380
Accumulated deficit	(398,194)	(384,753)
Total stockholders’ equity	4,946	9,723
Total liabilities and stockholders’ equity	$ 27,951	$ 29,485