Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 19,401	$ 19,439
Prepaid expenses and other current assets	227	389
Total current assets	19,628	19,828
Other assets	7	8
Total assets	19,635	19,836
Current liabilities:
Accounts payable, accrued expenses and other	463	589
Total current liabilities	463	589
Total liabilities	463	589
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at March 31, 2023 and December 31, 2022; no shares issued or outstanding at March 31, 2023 or December 31, 2022
Common stock, $0.01 par value: 30,000 shares authorized at March 31, 2023 and December 31, 2022; 14,255 and 14,215 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	1,343	1,342
Additional paid-in capital	565,736	565,541
Accumulated deficit	(547,907)	(547,636)
Total stockholders’ equity	19,172	19,247
Total liabilities and stockholders’ equity	$ 19,635	$ 19,836

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.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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.