Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 15,735	$ 16,580
Prepaid expenses and other current assets	3,631	2,112
Total current assets	19,366	18,692
Other assets	315	1,390
Total assets	19,681	20,082
Current liabilities:
Accounts payable, accrued expenses and other	2,279	2,714
Other current liability	56	56
Total current liabilities	2,335	2,770
Total liabilities	2,335	2,770
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value: 10,000 shares authorized at June 30, 2020 and December 31, 2019; no shares issued or outstanding at June 30, 2020 or December 31, 2019
Common stock, $0.01 par value: 30,000 shares authorized at June 30, 2020 and December 31, 2019; 13,380 shares issued and outstanding at June 30, 2020 and December 31, 2019	1,334	1,334
Additional paid-in capital	557,535	556,587
Accumulated deficit	(541,523)	(540,609)
Total stockholders’ equity	17,346	17,312
Total liabilities and stockholders’ equity	$ 19,681	$ 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.

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.