Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 13,890	$ 14,038
Prepaid expenses and other current assets	2,360	2,506
Total current assets	16,250	16,544
Other assets	191	232
Total assets	16,441	16,776
Current liabilities:
Accounts payable, accrued expenses and other	684	770
Total current liabilities	684	770
Total liabilities	684	770
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at March 31, 2021 and December 31, 2020; no shares issued or outstanding at March 31, 2021 or December 31, 2020
Common stock, $0.01 par value: 30,000 shares authorized at March 31, 2021 and December 31, 2020; 13,410 and 13,380 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	1,334	1,334
Additional paid-in capital	558,756	558,309
Accumulated deficit	(544,333)	(543,637)
Total stockholders’ equity	15,757	16,006
Total liabilities and stockholders’ equity	$ 16,441	$ 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.