Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 14,038	$ 16,580
Prepaid expenses and other current assets	2,506	2,112
Total current assets	16,544	18,692
Other assets	232	1,390
Total assets	16,776	20,082
Current liabilities:
Accounts payable, accrued expenses and other	770	2,714
Other current liability		56
Total current liabilities	770	2,770
Total liabilities	770	2,770
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at December 31, 2020 and 2019 no shares issued or outstanding at December 31, 2020 or 2019
Common stock, $0.01 par value: 30,000 shares authorized at December 31, 2020 and 2019; 13,380 shares issued and outstanding at December 31, 2020 and 2019	1,334	1,334
Additional paid-in capital	558,309	556,587
Accumulated deficit	(543,637)	(540,609)
Total stockholders’ equity	16,006	17,312
Total liabilities and stockholders’ equity	$ 16,776	$ 20,082

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.