Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 14,587,401	$ 16,130,410
Receivables	12,065	7,628
Prepaid expenses and other current assets	285,801	1,066,497
Total current assets	14,885,267	17,204,535
Equipment and furnishings, net	54,783	42,893
Other assets	19,366	7,590
Operating lease right-of-use assets	669,666
Total assets	15,629,082	17,255,018
Current liabilities:
Accounts payable	952,411	887,835
Accrued expenses and other current liabilities	1,131,130	1,092,895
Current portion of operating lease liabilities	174,772	69,576
Total current liabilities	2,258,313	2,050,306
Operating lease liabilities, net of current portion	507,012
Total liabilities	2,765,325	2,050,306
Commitments and contingencies
Stockholders' equity:
Preferred Stock, $0.01 par value, 833,333 shares authorized, including 50,000 shares of Series B Junior Participating Preferred Stock; no shares issued and outstanding
Common stock, $0.001 par value, 41,666,666 shares authorized; 33,637,501 shares issued and outstanding at June 30, 2020 and December 31, 2019	33,637	33,637
Additional paid-in capital	479,371,170	479,197,849
Accumulated deficit	(466,541,050)	(464,026,774)
Total stockholders' equity	12,863,757	15,204,712
Total liabilities and stockholders' equity	$ 15,629,082	$ 17,255,018