Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 21,837	$ 46,156
Restricted cash	0	1,501
Accounts receivable, interest and other receivables	0	205
Prepaid expenses and other current assets	1,964	1,269
Total current assets	23,801	49,131
Property and equipment, net	22	12
Total assets	23,823	49,143
Current liabilities:
Accounts payable	486	90
Accrued expenses and other current liabilities	2,477	3,849
Warrant derivative liability	809	2,773
Total current liabilities	3,772	6,712
Total liabilities	3,772	6,712
Commitments and contingencies
Redeemable Preferred stock: $0.01 par value; 10,000,000 shares authorized, Series 1 redeemable convertible preferred stock, $0.01 par value, 1,517,500 shares authorized at December 31, 2022 and December 31, 2021, 452,000 shares issued and outstanding at December 31, 2022 and December 31, 2021	18,036	18,036
Stockholders’ equity:
Common stock, $0.01 par value; 160,000,000 shares authorized at December 31, 2022 and 80,000,000 shares authorized at December 31, 2021; 8,682,447 shares issued and 8,614,701 shares outstanding at December 31, 2022; 8,497,025 shares issued and 8,429,279 shares outstanding at December 31, 2021	87	85
Treasury stock: 67,746 shares held at December 31, 2022 and December 31, 2021	(5,056)	(5,056)
Additional paid-in capital	582,763	580,156
Accumulated other comprehensive loss	(354)	(338)
Accumulated deficit	(575,425)	(550,452)
Total stockholders’ equity	2,015	24,395
Total liabilities, redeemable preferred stock and stockholders’ equity	$ 23,823	$ 49,143