CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 24,548	$ 27,605
Prepaid expenses and other current assets	7,866	5,109
Total current assets	32,414	32,714
Other assets	19	15
Total assets	32,433	32,729
Current liabilities:
Accounts payable	3,078	3,687
Accrued and other current liabilities	3,326	2,375
Accrued clinical site costs	658	469
Earnout Cash liability		4,582
Warrant liabilities	19	292
Note payable and accrued interest		518
Total liabilities	7,081	11,923
Preferred stock, $0.001 par value, 50,000,000 shares authorized; 0 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively
Common stock, $0.001 par value, 500,000,000 shares authorized; 66,641,314 and 58,810,550 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	67	59
Additional paid-in capital	228,958	203,990
Accumulated deficit	(203,673)	(183,243)
Total stockholders' equity	25,352	20,806
Total liabilities and stockholders' equity	$ 32,433	$ 32,729