Consolidated Balance Sheets - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 6,769,603	$ 10,003,375
Insurance claim receivable	200,000	325,105
Prepaid expenses and other current assets	1,310,382	1,094,675
Total current assets	8,279,985	11,423,155
Equipment and furnishings, net	32,784	39,758
Other assets	16,836	16,836
Operating lease right-of-use assets	397,172	580,478
Total assets	8,726,777	12,060,227
Current liabilities:
Accounts payable	1,470,652	1,402,054
Accrued expenses and other current liabilities	2,064,506	1,190,910
Current portion of operating lease obligations	198,819	181,103
Total current liabilities	3,733,977	2,774,067
Operating lease liabilities, net of current portion	216,381	415,200
Total liabilities	3,950,358	3,189,267
Preferred Stock, Series C 10% Convertible, $1,000 par value, 8,240 shares issued and outstanding	4,022,700
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 at December 31, 2021 and 2020, respectively
Common stock, $0.001 par value, 62,393,940 shares authorized; 38,780,038 and 36,480,038 shares issued and outstanding at December 31, 2021 and 2020, respectively	38,780	36,480
Additional paid-in capital	484,790,650	479,561,860
Accumulated deficit	(484,075,711)	(470,727,380)
Total stockholders’ equity	753,719	8,870,960
Total liabilities and stockholders’ equity	$ 8,726,777	$ 12,060,227