Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 7,174	$ 5,275
Accounts receivable, net of allowance for doubtful accounts of $56 and $41 at March 31, 2024 and December 31, 2023, respectively	1,377	1,014
Inventories, net	4,562	5,298
Prepaid expenses and other current assets	1,008	575
Total current assets	14,121	12,162
Right of use asset	1,991	1,102
Property and equipment, net	523	487
Other assets	225	19
Total assets	16,860	13,770
Current liabilities:
Accounts payable	747	777
Accrued compensation	2,523	2,311
Preferred stock dividends payable	65	0
Accrued expenses and other current liabilities	822	817
Leasehold liability, current portion	1,156	1,102
Borrowings	14,751	14,293
Total current liabilities	20,064	19,300
Leasehold liability, long-term portion	835	0
Other long-term liabilities	15	672
Total liabilities	20,914	19,972
Commitments and contingencies (Note 6)
Stockholders’ deficit:
Shares issued and outstanding: 19,229 and 62,881 at March 31, 2024 and December 31, 2023, respectively; aggregate liquidation preference related to Series E and Series F convertible preferred stock of $7,338 at March 31, 2024 and $62,796 at December 31, 2023 related to Series A and Series E convertible preferred stock	0	0
Shares issued and outstanding: 1,586,434 and 1,279,928 at March 31, 2024 and December 31, 2023, respectively	2	1
Additional paid-in capital	422,157	414,493
Accumulated deficit	(426,213)	(420,696)
Total stockholders’ deficit	(4,054)	(6,202)
Total liabilities and stockholders’ deficit	$ 16,860	$ 13,770