CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 115,005	$ 94,958
Prepaid expenses and other current assets	7,564	7,688
Total current assets	122,569	102,646
Property and equipment, net	3,153	1,164
Restricted cash	0	151
Other assets	4,366	1,800
Total assets	130,088	105,761
Current liabilities
Accounts payable	5,921	2,312
Accrued expenses	4,103	4,325
Operating lease obligations	314	363
Total current liabilities	10,338	7,000
Non-current liabilities
Operating lease obligations, less current portion	3,892	1,231
Long term debt, net	1,750	1,712
Total non-current liabilities	5,642	2,943
Total liabilities	15,980	9,943
Commitments and contingencies (Note 12)
Stockholders' equity
Common stock; $0.01 par value; 295,000,000 shares authorized, 216,271,262 and 199,502,183 shares issued, and 216,149,762 and 199,380,683 shares outstanding at June 30, 2022 and December 31, 2021, respectively	2,163	1,995
Treasury stock, at cost, 121,500 shares at June 30, 2022 and December 31, 2021	(48)	(48)
Additional paid-in capital	281,139	225,537
Accumulated other comprehensive income	10	0
Accumulated deficit	(169,157)	(131,667)
Total stockholders' equity	114,108	95,818
Total liabilities and stockholders' equity	130,088	105,761
Series A Preferred Stock
Stockholders' equity
Preferred stock issued	0	0
Series B Preferred Stock
Stockholders' equity
Preferred stock issued	$ 1	$ 1

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).