Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 14,203	$ 14,038
Prepaid expenses and other current assets	480	2,506
Total current assets	14,683	16,544
Other assets	66	232
Total assets	14,749	16,776
Current liabilities:
Accounts payable, accrued expenses and other	562	770
Total current liabilities	562	770
Total liabilities	562	770
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at December 31, 2021 and 2020 no shares issued or outstanding at December 31, 2021 or 2020
Common stock, $0.01 par value: 30,000 shares authorized at December 31, 2021 and 2020; 13,410 and 13,380 shares issued and outstanding at December 31, 2021 and 2020	1,334	1,334
Additional paid-in capital	558,945	558,309
Accumulated deficit	(546,092)	(543,637)
Total stockholders’ equity	14,187	16,006
Total liabilities and stockholders’ equity	$ 14,749	$ 16,776

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.