Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 16,039	$ 19,497
Accounts receivable, net of allowance for doubtful accounts of $9 at June 30, 2022 and $6 at December 31, 2021	1,279	1,393
Inventories	5,178	4,601
Prepaid expenses and other current assets	1,099	300
Total current assets	23,595	25,791
Right of use asset	2,696	3,179
Property and equipment, net	520	95
Other assets	357	420
Total assets	27,168	29,485
Current liabilities:
Accounts payable	727	1,394
Accrued compensation	1,493	1,609
Series A preferred stock dividends payable	2,255	0
Accrued expenses and other current liabilities	744	718
Leasehold liability, current portion	1,038	985
Total current liabilities	6,257	4,706
Borrowings, long-term portion	13,187	12,287
Leasehold liability, long-term portion	1,658	2,194
Other long-term liabilities	745	575
Total liabilities	21,847	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 June 30, 2022 and December 31, 2021; Shares issued and outstanding: 56,451 at June 30, 2022 and December 31, 2021; aggregate liquidation preference of $56,366 at June 30, 2022 and December 31, 2021	0	0
Common stock, par value of $0.001; Shares authorized: 100,000,000 at June 30, 2022 and December 31, 2021; Shares issued and outstanding: 6,081,333 and 4,778,263 at June 30, 2022 and December 31, 2021, respectively	6	96
Additional paid-in capital	399,422	394,380
Accumulated deficit	(394,107)	(384,753)
Total stockholders’ equity	5,321	9,723
Total liabilities and stockholders’ equity	$ 27,168	$ 29,485