CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 32,150	$ 46,620
Prepaid expenses and other current assets	438	289
Total current assets	32,588	46,909
Fixed assets, net	14	32
Total assets	32,602	46,941
Current Liabilities
Accounts payable	2,159	2,090
Accrued expenses	699	834
Total current liabilities	$ 2,858	$ 2,924
Commitments and contingencies (note 6)
Stockholders' Equity
Undesignated Preferred Stock, $.001 par value, 5,000,000 shares authorized, none issued and outstanding	$ 0	$ 0
Common Stock, $.001 par value, 75,000,000 shares authorized, 24,393,368 and 24,388,523 shares issued, respectively and 24,281,018 and 24,276,173 shares outstanding, respectively	24	24
Additional paid-in capital	320,480	318,437
Cost of treasury stock, 112,350 shares	(1,380)	(1,380)
Accumulated deficit	(289,380)	(273,064)
Total stockholders' equity	29,744	44,017
Total liabilities and stockholders' equity	$ 32,602	$ 46,941

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).

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- 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).