CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 20,054	$ 27,605
Prepaid expenses and other current assets	5,741	5,109
Total current assets	25,795	32,714
Other assets	21	15
Total assets	25,816	32,729
Current liabilities:
Accounts payable	2,076	3,687
Accrued and other current liabilities	4,855	2,375
Accrued clinical site costs	914	469
Earnout Cash liability		4,582
Convertible note payable and accrued interest - short term	7,703
Warrant liabilities	37	292
Note payable and accrued interest		518
Total current liabilities	15,585	11,923
Convertible note payable and accrued interest - long term	2,822
Total liabilities	18,407	11,923
Preferred stock, $0.001 par value, 50,000,000 shares authorized; 0 shares issued and outstanding at December 31, 2022 and December 31, 2021, respectively
Common stock, $0.001 par value, 500,000,000 shares authorized; 66,442,989 and 58,810,550 shares issued and outstanding at December 31, 2022 and 2021, respectively	67	59
Additional paid-in capital	230,339	203,990
Accumulated deficit	(222,997)	(183,243)
Total stockholders' equity	7,409	20,806
Total liabilities and stockholders' equity	$ 25,816	$ 32,729