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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and cash equivalents $ 111us-gaap_CashAndCashEquivalentsAtCarryingValue $ 805us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 2,861us-gaap_MarketableSecurities 3,500us-gaap_MarketableSecurities
Prepaid expenses and other assets 71us-gaap_PrepaidExpenseAndOtherAssetsCurrent 107us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 3,043us-gaap_AssetsCurrent 4,412us-gaap_AssetsCurrent
Property and equipment, net 4us-gaap_PropertyPlantAndEquipmentNet 4us-gaap_PropertyPlantAndEquipmentNet
Patent portfolios 52,582us-gaap_FiniteLivedIntangibleAssetsNet 55,004us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill 1,712us-gaap_Goodwill 1,712us-gaap_Goodwill
Deposit 26us-gaap_DepositsAssetsNoncurrent 26us-gaap_DepositsAssetsNoncurrent
Total assets 57,367us-gaap_Assets 61,158us-gaap_Assets
Current liabilities    
Accounts payable and accrued expenses 674us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 728us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued salaries and benefits 634us-gaap_EmployeeRelatedLiabilitiesCurrent 329us-gaap_EmployeeRelatedLiabilitiesCurrent
Short-term lease liabilities 174us-gaap_LiabilitiesOfAssetsHeldForSale 173us-gaap_LiabilitiesOfAssetsHeldForSale
Total current liabilities 1,482us-gaap_LiabilitiesCurrent 1,230us-gaap_LiabilitiesCurrent
Long-term lease liabilities 363us-gaap_DeferredRentCreditNoncurrent 407us-gaap_DeferredRentCreditNoncurrent
Total liabilities 1,845us-gaap_Liabilities 1,637us-gaap_Liabilities
Series I redeemable preferred stock, $0.0001 par value; 35,541 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively; liquidation preference of $167 per share 5,935us-gaap_PreferredStockRedemptionAmount 5,935us-gaap_PreferredStockRedemptionAmount
Commitments and contingencies     
Stockholders' equity    
Common stock, $0.0001 par value, 200,000,000 shares authorized; 28,612,195 and 28,609,695 shares issued at March 31, 2015 and December 31, 2014, respectively; 28,611,967 and 28,609,467 shares outstanding at March 31, 2015 and December 31, 2014, respectively 3us-gaap_CommonStockValue 3us-gaap_CommonStockValue
Additional paid-in-capital 137,742us-gaap_AdditionalPaidInCapital 137,655us-gaap_AdditionalPaidInCapital
Treasury stock, at cost, 228 shares at March 31, 2015 and December 31, 2014, respectively (264)us-gaap_TreasuryStockValue (264)us-gaap_TreasuryStockValue
Accumulated deficit (87,894)us-gaap_RetainedEarningsAccumulatedDeficit (83,808)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 49,587us-gaap_StockholdersEquity 53,586us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 57,367us-gaap_LiabilitiesAndStockholdersEquity 61,158us-gaap_LiabilitiesAndStockholdersEquity
Series A Preferred Stock [Member]    
Stockholders' equity    
Preferred stock      
Series C Convertible Preferred Stock [Member]    
Stockholders' equity    
Preferred stock      
Series D Preferred Stock [Member]    
Stockholders' equity    
Preferred stock      
Series D-1 Convertible Preferred Stock [Member]    
Stockholders' equity    
Preferred stock      
Series F-1 Convertible Preferred Stock [Member]    
Stockholders' equity    
Preferred stock      
Series H Convertible Preferred Stock [Member]    
Stockholders' equity    
Preferred stock      
Series J Convertible Preferred Stock [Member]    
Stockholders' equity    
Preferred stock