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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 29,363us-gaap_CashAndCashEquivalentsAtCarryingValue $ 24,189us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses and other current assets 5,514us-gaap_PrepaidExpenseAndOtherAssetsCurrent 4,640us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Current assets of discontinued operations 147us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 171us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current assets 35,024us-gaap_AssetsCurrent 29,000us-gaap_AssetsCurrent
Property, plant and equipment (net) 333us-gaap_PropertyPlantAndEquipmentNet 387us-gaap_PropertyPlantAndEquipmentNet
Total assets 35,357us-gaap_Assets 29,387us-gaap_Assets
Current liabilities:    
Accounts payable 4,007us-gaap_AccountsPayableCurrent 2,792us-gaap_AccountsPayableCurrent
Accrued and other current liabilities 4,054us-gaap_AccruedLiabilitiesCurrent 4,626us-gaap_AccruedLiabilitiesCurrent
Current liabilities of discontinued operations 75us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent 75us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current liabilities 8,136us-gaap_LiabilitiesCurrent 7,493us-gaap_LiabilitiesCurrent
Other liabilities 192us-gaap_OtherLiabilities 206us-gaap_OtherLiabilities
Total liabilities 8,328us-gaap_Liabilities 7,699us-gaap_Liabilities
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2014 and March 31, 2015; 335,273 shares issued and outstanding at December 31, 2014 and March 31, 2015. Aggregate preference in liquidation of $3,989,749 at December 31, 2014 and March 31, 2015      
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2014 and March 31, 2015; 23,199,469 and 34,388,485 shares issued and outstanding at December 31, 2014 and March 31, 2015, respectively 34us-gaap_CommonStockValue 23us-gaap_CommonStockValue
Additional paid-in capital 341,415us-gaap_AdditionalPaidInCapital 330,962us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss (691)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (480)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (313,729)us-gaap_RetainedEarningsAccumulatedDeficit (308,817)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 27,029us-gaap_StockholdersEquity 21,688us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 35,357us-gaap_LiabilitiesAndStockholdersEquity $ 29,387us-gaap_LiabilitiesAndStockholdersEquity