Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 8,434,836	$ 10,003,375
Insurance claim receivable		325,105
Prepaid expenses and other current assets	326,323	1,094,675
Total current assets	8,761,159	11,423,155
Equipment and furnishings, net	33,171	39,758
Other assets	16,836	16,836
Operating lease right-of-use assets	489,645	580,478
Total assets	9,300,811	12,060,227
Current liabilities:
Accounts payable	962,998	1,402,054
Accrued expenses and other current liabilities	1,336,860	1,190,910
Current portion of operating lease liabilities	184,760	181,103
Total current liabilities	2,484,618	2,774,067
Operating lease liabilities, net of current portion	322,332	415,200
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; 36,780,038 shares issued and outstanding at June 30, 2021 and 36,480,038 shares issued and outstanding at December 31, 2020	36,780	36,480
Additional paid-in capital	479,639,560	479,561,860
Accumulated deficit	(473,182,479)	(470,727,380)
Total stockholders’ equity	6,493,861	8,870,960
Total liabilities and stockholders’ equity	$ 9,300,811	$ 12,060,227