Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 1,646	$ 4,595
Prepaid expense and other current assets	2,460	2,289
Total current assets	4,106	6,884
Other assets	356	431
Total assets	4,462	7,315
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Accounts payable	4,866	4,632
Accrued and other current liabilities	9,444	4,714
Accrued clinical site costs	403	524
Convertible note payable and accrued interest, current	3,050	9,161
Insurance loan payable	634	0
Warrant liabilities	1,902	17
Total current liabilities	20,299	19,048
Convertible note payable and accrued interest, long term	2,985	0
Total liabilities	23,284	19,048
Commitments and Contingencies (Note 8)
Common stock, $0.001 par value, 500,000,000 shares authorized; 11,373,246 and 8,391,940 shares issued and outstanding at September 30, 2024 and December 31, 2023, respectively	11	8
Additional paid-in capital	250,362	241,406
Accumulated other comprehensive loss	0	(3)
Accumulated deficit	(269,195)	(253,147)
Total stockholders’ deficit	(18,822)	(11,733)
Total liabilities and stockholders' deficit	4,462	7,315
Nondesignated Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Preferred stock, $0.001 par value, 50,000,000 shares authorized.	0	0
Series A Convertible Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Preferred stock, $0.001 par value, 50,000,000 shares authorized.	$ 0	$ 3