CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 77,563	$ 94,958
Marketable securities	13,371	0
Prepaid expenses and other current assets	7,558	7,688
Total current assets	98,492	102,646
Property and equipment, net	6,053	1,164
Restricted cash	0	151
Other assets	4,087	1,800
Total assets	108,632	105,761
Current liabilities
Accounts payable	8,062	2,312
Accrued expenses and other current liabilities	9,900	4,325
Operating lease obligations	498	363
Total current liabilities	18,460	7,000
Non-current liabilities
Operating lease obligations, less current portion	3,587	1,231
Long term debt, net	2,289	1,712
Other non-current liabilities	244	0
Total non-current liabilities	6,120	2,943
Total liabilities	24,580	9,943
Commitments and contingencies (Note 15)
Stockholders' equity
Common stock; $0.01 par value; 295,000,000 shares authorized; 221,721,182 and 199,502,183 shares issued, and 221,599,682 and 199,380,683 shares outstanding at December 31, 2022 and 2021, respectively	2,217	1,995
Treasury stock, at cost, 121,500 shares at December 31, 2022 and 2021	(48)	(48)
Additional paid-in capital	294,874	225,537
Accumulated other comprehensive income	26	0
Accumulated deficit	(213,018)	(131,667)
Total stockholders' equity	84,052	95,818
Total liabilities and stockholders' equity	108,632	105,761
Series A Convertible Preferred Stock
Stockholders' equity
Preferred stock issued	0	0
Series B Convertible Preferred Stock
Stockholders' equity
Preferred stock issued	$ 1	$ 1