CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 37,875	$ 46,620
Prepaid expenses and other current assets	569	289
Total current assets	38,444us-gaap_AssetsCurrent	46,909us-gaap_AssetsCurrent
Fixed assets, net	22us-gaap_PropertyPlantAndEquipmentNet	32us-gaap_PropertyPlantAndEquipmentNet
Total assets	38,466us-gaap_Assets	46,941us-gaap_Assets
Current Liabilities
Accounts payable	1,159us-gaap_AccountsPayableCurrent	2,090us-gaap_AccountsPayableCurrent
Accrued expenses	793us-gaap_AccruedLiabilitiesCurrent	834us-gaap_AccruedLiabilitiesCurrent
Total current liabilities	1,952us-gaap_LiabilitiesCurrent	2,924us-gaap_LiabilitiesCurrent
Commitments & Contingencies (note 6)
Stockholders' Equity
Undesignated Preferred Stock, $.001 par value, 5,000,000 shares authorized, none issued and outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common Stock, $.001 par value, 75,000,000 shares authorized, 24,388,523 shares issued; 24,276,173 shares outstanding	24us-gaap_CommonStockValue	24us-gaap_CommonStockValue
Additional paid-in capital	319,459us-gaap_AdditionalPaidInCapital	318,437us-gaap_AdditionalPaidInCapital
Cost of treasury stock, 112,350 shares	(1,380)us-gaap_TreasuryStockValue	(1,380)us-gaap_TreasuryStockValue
Accumulated deficit	(281,589)	(273,064)
Total stockholders' equity	36,514us-gaap_StockholdersEquity	44,017us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 38,466	$ 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).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682