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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 $ 805us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,125us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 3,500us-gaap_MarketableSecurities   
Prepaid expenses and other assets 107us-gaap_PrepaidExpenseAndOtherAssetsCurrent 151us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 4,412us-gaap_AssetsCurrent 3,276us-gaap_AssetsCurrent
Property and equipment, net 4us-gaap_PropertyPlantAndEquipmentNet   
Patent portfolios, net 55,004us-gaap_FiniteLivedIntangibleAssetsNet 64,835us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill 1,712us-gaap_Goodwill 1,712us-gaap_Goodwill
Deposit 26us-gaap_DepositsAssetsNoncurrent 30us-gaap_DepositsAssetsNoncurrent
Total assets 61,158us-gaap_Assets 69,853us-gaap_Assets
Current liabilities    
Accounts payable and accrued expenses 728us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 270us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued salaries and benefits 329us-gaap_EmployeeRelatedLiabilitiesCurrent 233us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued patent cost    1,000us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts
Short-term lease liabilities 173us-gaap_CapitalLeaseObligationsCurrent   
Total current liabilities 1,230us-gaap_LiabilitiesCurrent 1,503us-gaap_LiabilitiesCurrent
Long-term lease liabilities 407us-gaap_DeferredRentCreditNoncurrent   
Warrant liability    48us-gaap_DerivativeLiabilitiesNoncurrent
Total liabilities 1,637us-gaap_Liabilities 1,551us-gaap_Liabilities
Series I redeemable preferred stock, $0.0001 par value; 35,541 shares and 119,760 shares issued and outstanding at December 31, 2014 and 2013, respectively; liquidation preference of $167 per share 5,935us-gaap_PreferredStockRedemptionAmount 20,000us-gaap_PreferredStockRedemptionAmount
Commitments and contingencies      
Stockholders' equity    
Common stock, $0.0001 par value, 200,000,000 shares authorized; 28,609,695 shares and 3,770,113 shares issued at December 31, 2014 and 2013, respectively; 28,609,467 and 3,769,712 shares outstanding at December 31, 2014 and 2013, respectively 3us-gaap_CommonStockValue   
Additional paid-in-capital 137,655us-gaap_AdditionalPaidInCapital 102,043us-gaap_AdditionalPaidInCapital
Treasury stock, at cost, 228 and 401 shares at December 31, 2014 and 2013, respectively (264)us-gaap_TreasuryStockValue (465)us-gaap_TreasuryStockValue
Accumulated deficit (83,808)us-gaap_RetainedEarningsAccumulatedDeficit (53,276)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 53,586us-gaap_StockholdersEquity 48,302us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 61,158us-gaap_LiabilitiesAndStockholdersEquity 69,853us-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