Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 14,909	$ 14,038
Prepaid expenses and other current assets	805	2,506
Total current assets	15,714	16,544
Other assets	149	232
Total assets	15,863	16,776
Current liabilities:
Accounts payable, accrued expenses and other	772	770
Total current liabilities	772	770
Total liabilities	772	770
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at June 30, 2021 and December 31, 2020; no shares issued or outstanding at June 30, 2021 or December 31, 2020
Common stock, $0.01 par value: 30,000 shares authorized at June 30, 2021 and December 31, 2020; 13,410 and 13,380 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	1,334	1,334
Additional paid-in capital	558,849	558,309
Accumulated deficit	(545,092)	(543,637)
Total stockholders’ equity	15,091	16,006
Total liabilities and stockholders’ equity	$ 15,863	$ 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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Balance Type:	credit
Period Type:	instant

- 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.