Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 42,604,935	$ 38,524,536
Prepaid research and development contracts	510,177	311,154
Other current assets	1,603,913	734,785
Total current assets	44,719,025	39,570,475
Furniture and equipment, net	121,730	164,187
Operating lease right-of-use assets, net	63,919	162,124
Deposits	20,000	40,000
Total assets	44,924,674	39,936,786
Current liabilities:
Accounts payable and accrued expenses	1,799,371	3,231,450
Current portion of operating lease liability	67,438	102,555
Total current liabilities	1,866,809	3,334,005
Operating lease liability, net of current portion		67,438
Total liabilities	1,866,809	3,401,443
Commitments and contingencies (Note 10)
Stockholders’ equity:
Common stock, $0.0001 par value per share; 300,000,000 shares authorized and 47,251,319 and 40,588,004 shares issued and outstanding at December 31, 2020 and 2019.	4,725	4,059
Additional paid-in capital	189,603,985	178,766,806
Accumulated deficit	(146,550,845)	(142,235,522)
Total stockholders’ equity	43,057,865	36,535,343
Total liabilities and stockholders’ equity	$ 44,924,674	$ 39,936,786

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.