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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
5 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2014
Dec. 31, 2013
Jul. 31, 2012
Cash flows from operating activities:          
Net loss $ (3,400)us-gaap_NetIncomeLoss $ (587)us-gaap_NetIncomeLoss $ (30,933)us-gaap_NetIncomeLoss $ (15,282)us-gaap_NetIncomeLoss $ (5,311)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:          
Depreciation 5us-gaap_Depreciation 1us-gaap_Depreciation 817us-gaap_Depreciation 286us-gaap_Depreciation 2us-gaap_Depreciation
Amortization of intangible assets 38us-gaap_AmortizationOfIntangibleAssets 64us-gaap_AmortizationOfIntangibleAssets 71us-gaap_AmortizationOfIntangibleAssets 77us-gaap_AmortizationOfIntangibleAssets 203us-gaap_AmortizationOfIntangibleAssets
Amortization of investment discount       269us-gaap_InvestmentIncomeAmortizationOfDiscount 76us-gaap_InvestmentIncomeAmortizationOfDiscount   
Equity-based compensation 533us-gaap_ShareBasedCompensation 273us-gaap_ShareBasedCompensation 9,624us-gaap_ShareBasedCompensation 3,828us-gaap_ShareBasedCompensation 782us-gaap_ShareBasedCompensation
Impairment loss 333us-gaap_AssetImpairmentCharges    3us-gaap_AssetImpairmentCharges 11us-gaap_AssetImpairmentCharges 1,997us-gaap_AssetImpairmentCharges
Unrealized gain on investments             (24)us-gaap_GainLossOnInvestments
Realized gain on sale of investments, interest and dividends reinvested             (8)us-gaap_OtherNoncashExpense
(Increase) decrease in assets:          
Accounts receivable (13)us-gaap_IncreaseDecreaseInAccountsReceivable 2us-gaap_IncreaseDecreaseInAccountsReceivable (54)us-gaap_IncreaseDecreaseInAccountsReceivable 739us-gaap_IncreaseDecreaseInAccountsReceivable 591us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory 10us-gaap_IncreaseDecreaseInInventories          20us-gaap_IncreaseDecreaseInInventories
Prepaid expense and other 2us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (8)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (166)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (114)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 3us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase (decrease) in liabilities:          
Accounts payable 236us-gaap_IncreaseDecreaseInAccountsPayable 41us-gaap_IncreaseDecreaseInAccountsPayable 1,336us-gaap_IncreaseDecreaseInAccountsPayable 205us-gaap_IncreaseDecreaseInAccountsPayable 27us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities 127us-gaap_IncreaseDecreaseInAccruedLiabilities 7us-gaap_IncreaseDecreaseInAccruedLiabilities 80us-gaap_IncreaseDecreaseInAccruedLiabilities (356)us-gaap_IncreaseDecreaseInAccruedLiabilities 719us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue and income (7)us-gaap_IncreaseDecreaseInDeferredRevenue 95us-gaap_IncreaseDecreaseInDeferredRevenue 168us-gaap_IncreaseDecreaseInDeferredRevenue 781us-gaap_IncreaseDecreaseInDeferredRevenue 76us-gaap_IncreaseDecreaseInDeferredRevenue
Deferred compensation    (73)us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense       107us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Net cash used in operating activities (2,136)us-gaap_NetCashProvidedByUsedInOperatingActivities (185)us-gaap_NetCashProvidedByUsedInOperatingActivities (18,785)us-gaap_NetCashProvidedByUsedInOperatingActivities (9,749)us-gaap_NetCashProvidedByUsedInOperatingActivities (816)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:          
Purchases of equipment and capitalized patents (158)us-gaap_PaymentsToAcquireProductiveAssets (19)us-gaap_PaymentsToAcquireProductiveAssets (1,933)us-gaap_PaymentsToAcquireProductiveAssets (1,158)us-gaap_PaymentsToAcquireProductiveAssets 96us-gaap_PaymentsToAcquireProductiveAssets
Contribution to deferred compensation trust    16us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition       (150)us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationEmployeeStockPurchaseProgramRequisiteServicePeriodRecognition
Purchase of available-for-sale securities       (7,657)us-gaap_PaymentsToAcquireMarketableSecurities (12,014)us-gaap_PaymentsToAcquireMarketableSecurities   
Sales of available-for-sale securities       861us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds      
Maturity of available-for-sale securities       5,357us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities      
Net cash used in investing activities (158)us-gaap_NetCashProvidedByUsedInInvestingActivities (3)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,372)us-gaap_NetCashProvidedByUsedInInvestingActivities (13,172)us-gaap_NetCashProvidedByUsedInInvestingActivities (246)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:          
Exercise of warrants and options 100us-gaap_ProceedsFromStockOptionsExercised    923us-gaap_ProceedsFromStockOptionsExercised 20,969us-gaap_ProceedsFromStockOptionsExercised 129us-gaap_ProceedsFromStockOptionsExercised
Issuance of common stock and warrants       44,875us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims 19,912us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims 14,420us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
Payments on capital lease obligations       (107)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations      
Net cash provided by financing activities 100us-gaap_NetCashProvidedByUsedInFinancingActivities    45,691us-gaap_NetCashProvidedByUsedInFinancingActivities 40,881us-gaap_NetCashProvidedByUsedInFinancingActivities 14,549us-gaap_NetCashProvidedByUsedInFinancingActivities
Increase (decrease) in cash and cash equivalents (2,194)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (188)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 23,534us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 17,960us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 13,487us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 14,263us-gaap_CashAndCashEquivalentsAtCarryingValue 776us-gaap_CashAndCashEquivalentsAtCarryingValue 30,029us-gaap_CashAndCashEquivalentsAtCarryingValue 12,069us-gaap_CashAndCashEquivalentsAtCarryingValue 776us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 12,069us-gaap_CashAndCashEquivalentsAtCarryingValue $ 588us-gaap_CashAndCashEquivalentsAtCarryingValue $ 53,563us-gaap_CashAndCashEquivalentsAtCarryingValue $ 30,029us-gaap_CashAndCashEquivalentsAtCarryingValue $ 14,263us-gaap_CashAndCashEquivalentsAtCarryingValue