Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 24,579	$ 43,145
Prepaid expenses and other current assets	3,024	2,451
Total current assets	27,603	45,596
Furniture and equipment, net	225	275
Intangible assets	11,148	11,148
Operating lease right-of-use asset	547	403
Total assets	39,523	57,422
Current liabilities:
Accounts payable	2,008	2,095
Accrued expenses and other current liabilities	1,880	2,724
Total current liabilities	3,888	4,819
Operating lease liability - long-term, net of current portion	496	335
Warrant liability - long-term	1	77
Total liabilities	4,385	5,231
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; 29,810,443 and 28,627,827 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively	30	29
Additional paid-in capital	156,446	153,985
Accumulated other comprehensive income (loss)	(3)	12
Accumulated deficit	(121,335)	(101,835)
Total stockholders’ equity	35,138	52,191
Total liabilities and stockholders’ equity	$ 39,523	$ 57,422