Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 9,405	$ 23,550
Prepaid expenses and other current assets	2,201	2,723
Total current assets	11,606	26,273
Furniture and equipment, net	190	272
Intangible assets	11,148	11,148
Operating lease right-of-use asset	450	524
Total assets	23,394	38,217
Liabilities, Current [Abstract]
Accounts payable	2,550	2,498
Accrued expenses and other current liabilities	3,043	4,317
Total current liabilities	5,593	6,815
Operating lease liability - long-term, net of current portion	390	474
Warrant liability - long-term	9,932	4,855
Total liabilities	15,915	12,144
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 3,001,895 and 2,227,516 shares issued and outstanding at September 30, 2024 and December 31, 2023, respectively	3	33
Additional paid-in capital	158,957	157,653
Accumulated other comprehensive income (loss)	4	(9)
Accumulated deficit	(151,485)	(131,604)
Total stockholders’ equity	7,479	26,073
Total liabilities and stockholders’ equity	$ 23,394	$ 38,217