Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 53,422,532	$ 62,614,010
Prepaid research and development contracts	340,414	754,392
Other current assets	536,071	615,681
Total current assets	54,299,017	63,984,083
Furniture and equipment, net	198,742	98,449
Operating lease right-of-use assets, net	517,976
Deposits	40,960	40,960
Total assets	55,056,695	64,123,492
Current liabilities:
Accounts payable and accrued expenses	3,734,012	5,456,917
Current portion of operating lease liability	189,511
Total current liabilities	3,923,523	5,456,917
Operating lease liability, net of current portion	337,737
Total liabilities	4,261,260	5,456,917
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.0001 par value per share; 300,000,000 shares authorized and 40,588,004 shares issued and outstanding at March 31, 2019 and December 31, 2018.	4,059	4,059
Additional paid-in capital	178,249,209	177,621,807
Accumulated deficit	(127,457,833)	(118,959,291)
Total stockholders’ equity	50,795,435	58,666,575
Total liabilities and stockholders’ equity	$ 55,056,695	$ 64,123,492

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.