Condensed Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 16,655	$ 21,388
Accounts receivable, net	4,240	3,411
Inventories	2,318	911
Prepaid expenses and other current assets	1,050	1,129
Total current assets	24,263	26,839
Property and equipment, net	57	58
Intangible assets, net	6,388	4,739
Operating Lease, Right-of-Use Asset	74	92
Other long-term assets, net	12	12
Total assets	30,794	31,740
Liabilities, Current [Abstract]
Accounts payable	2,263	1,848
Debt, net of unamortized discount	5,020	5,380
Accrued Liabilities, Current	8,017	9,013
Total current liabilities	15,300	16,241
Operating lease liabilities, net of current portion	0	22
Total liabilities	15,300	16,263
Commitments and contingencies (Note 11)
Stockholders’ equity
Common stock, $0.001 par value; 50,000,000 shares authorized; 25,690,562 and 25,688,062 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively	26	26
Additional paid-in capital	120,349	119,521
Accumulated deficit	(104,881)	(104,070)
Total stockholders’ equity	15,494	15,477
Total liabilities and stockholders’ equity	$ 30,794	$ 31,740