CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash	$ 7,240	$ 7,478
Other current assets	120	94
Total current assets	7,360	7,572
Refundable tax credits receivable	1,940	1,940
Total assets	9,300	9,512
Current liabilities:
Accounts payable	313	225
Accrued expenses and other current liabilities	155	143
Total current liabilities	468	368
Commitments and contingencies
Stockholders’ equity:
Preferred stock - $0.01 par value, authorized 3,000,000 shares; no shares issued and outstanding at March 31, 2018 and December 31, 2017	0	0
Common stock - $0.01 par value, authorized 170,000,000 shares; issued and outstanding 44,214,603 shares at March 31, 2018 and December 31, 2017	442	442
Additional paid-in capital	83,649	83,649
Accumulated deficit	(75,259)	(74,947)
Total stockholders’ equity	8,832	9,144
Total liabilities and stockholders’ equity	$ 9,300	$ 9,512

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).