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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 24,189us-gaap_CashAndCashEquivalentsAtCarryingValue $ 31,146us-gaap_CashAndCashEquivalentsAtCarryingValue
Prepaid expenses and other current assets 4,640us-gaap_PrepaidExpenseAndOtherAssetsCurrent 3,388us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Current assets of discontinued operations 171us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 639us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current assets 29,000us-gaap_AssetsCurrent 35,173us-gaap_AssetsCurrent
Property, plant and equipment (net) 387us-gaap_PropertyPlantAndEquipmentNet 275us-gaap_PropertyPlantAndEquipmentNet
Long-term assets of discontinued operations   72us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent
Total assets 29,387us-gaap_Assets 35,520us-gaap_Assets
Current liabilities:    
Accounts payable 2,792us-gaap_AccountsPayableCurrent 2,545us-gaap_AccountsPayableCurrent
Accrued and other current liabilities 4,626us-gaap_AccruedLiabilitiesCurrent 4,431us-gaap_AccruedLiabilitiesCurrent
Other liabilities measured at fair value   20us-gaap_OtherLiabilitiesCurrent
Current liabilities of discontinued operations 75us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent 260us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current liabilities 7,493us-gaap_LiabilitiesCurrent 7,256us-gaap_LiabilitiesCurrent
Other liabilities 206us-gaap_OtherLiabilitiesNoncurrent 241us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 7,699us-gaap_Liabilities 7,497us-gaap_Liabilities
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized at December 31, 2013 and 2014; 335,273 shares issued and outstanding at December 31, 2013 and 2014. Aggregate preference in liquidation of $3,989,749 at December 31, 2013 and 2014.      
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2013 and 2014; 19,369,332 and 23,199,469 shares issued and outstanding at December 31, 2013 and 2014, respectively. 23us-gaap_CommonStockValue 19us-gaap_CommonStockValue
Additional paid-in capital 330,962us-gaap_AdditionalPaidInCapital 317,543us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (loss) (480)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (109)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (308,817)us-gaap_RetainedEarningsAccumulatedDeficit (289,430)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 21,688us-gaap_StockholdersEquity 28,023us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 29,387us-gaap_LiabilitiesAndStockholdersEquity $ 35,520us-gaap_LiabilitiesAndStockholdersEquity