CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 39,648,000	$ 27,142,000
Prepaid expenses and other current assets	2,172,000	2,323,000
Total current assets	41,820,000	29,465,000
Property and equipment, net	0	0
Other	7,000	135,000
Total assets	41,827,000	29,600,000
Current liabilities:
Accounts payable	1,805,000	1,292,000
Accrued expenses	7,163,000	4,042,000
Accrued dividends payable	65,000	65,000
Total current liabilities	9,033,000	5,399,000
Convertible notes payable and accrued interest, net of debt discounts - related party (Note 5)	29,048,000	0
Derivative liabilities (Note 6)	1,130,000	0
Other liabilities	0	8,000
Total liabilities	39,211,000	5,407,000
Commitments and contingencies (Note 12)
Series C 6% super dividend redeemable convertible preferred stock; 1,000 shares authorized, 176 issued and outstanding at December 31, 2021 and 2020, redemption value: $8,441,000, liquidation value: $1,786,000 at December 31, 2021	1,723,000	1,723,000
Stockholders' equity:
Undesignated stock, $0.01 par value; 20,000,000 shares authorized at December 31, 2021 and 2020, 20,000,000 shares designated at December 31, 2021 and 2020, respectively	0	0
Series A 12% convertible preferred stock; 1,742,500 shares authorized, 1,302,500 issued and outstanding at December 31, 2021 and 2020, liquidation value $1,302,500 at December 31, 2021	527,000	527,000
Common stock, $0.001 par value; 150,000,000 and 100,000,000 shares authorized at December 31, 2021 and 2020, respectively, 59,341,305 and 57,077,055 issued and outstanding at December 31, 2021 and 2020, respectively	59,000	56,000
Additional paid-in capital	271,001,000	261,883,000
Accumulated deficit	(270,694,000)	(239,996,000)
Total stockholders' equity	893,000	22,470,000
Total liabilities, redeemable convertible preferred stock and stockholders' equity	$ 41,827,000	$ 29,600,000