CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 18,592,000	$ 39,648,000
Prepaid expenses and other current assets	1,960,000	2,172,000
Total current assets	20,552,000	41,820,000
Property and equipment, net	0	0
Other	733,000	7,000
Total assets	21,285,000	41,827,000
Current liabilities:
Accounts payable	3,890,000	1,805,000
Accrued expenses	9,058,000	7,163,000
Accrued dividends payable	64,000	65,000
Total current liabilities	13,012,000	9,033,000
Convertible note payable and accrued interest, net of debt discount - related party (Note 5)	29,964,000	29,048,000
Derivative liabilities (Note 6)	573,000	1,130,000
Borrowing and accrued interest under convertible line of credit, net of debt discount - related party (Note 10)	9,864,000	0
Other liabilities	66,000	0
Total liabilities	53,479,000	39,211,000
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, 2022 and 2021, redemption value: $8,335,000, liquidation value: $1,786,000 at December 31, 2022	1,723,000	1,723,000
Stockholders' equity (deficit):
Undesignated stock, $0.01 par value; 20,000,000 shares authorized at December 31, 2022 and 2021, 20,000,000 shares designated at December 31, 2022 and 2021, respectively	0	0
Series A 12% convertible preferred stock; 1,742,500 shares authorized, 1,260,000 and 1,302,500 issued and outstanding at December 31, 2022 and 2021, respectively, liquidation value $1,260,000 at December 31, 2022	510,000	527,000
Common stock, $0.001 par value; 150,000,000 shares authorized at December 31, 2022 and 2021, 59,426,005 and 59,341,305 issued and outstanding at December 31, 2022 and 2021, respectively	59,000	59,000
Additional paid-in capital	275,081,000	271,001,000
Retained deficit	(309,567,000)	(270,694,000)
Total stockholders' equity (deficit)	(33,917,000)	893,000
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	$ 21,285,000	$ 41,827,000