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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net loss and comprehensive loss $ (4,842)us-gaap_NetIncomeLoss $ (4,694)us-gaap_NetIncomeLoss
Depreciation 61us-gaap_DepreciationDepletionAndAmortization 64us-gaap_DepreciationDepletionAndAmortization
Amortization of debt discount and issuance costs 222us-gaap_AmortizationOfDebtDiscountPremium 207us-gaap_AmortizationOfDebtDiscountPremium
Interest expense added to loan principal 1,971us-gaap_PaidInKindInterest 1,838us-gaap_PaidInKindInterest
Compensation charge for stock and share option awards 260us-gaap_ShareBasedCompensation 30us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:    
Decrease (increase) in accounts receivable 170us-gaap_IncreaseDecreaseInAccountsReceivable (10)us-gaap_IncreaseDecreaseInAccountsReceivable
Increase in prepaid expenses and other (478)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (298)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase in other assets (272)us-gaap_IncreaseDecreaseInOtherOperatingAssets (271)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Increase (decrease) in accounts payable 315us-gaap_IncreaseDecreaseInAccountsPayable (746)us-gaap_IncreaseDecreaseInAccountsPayable
Decrease in accrued liabilities (43)us-gaap_IncreaseDecreaseInAccruedLiabilities (554)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash used for operating activities (2,636)us-gaap_NetCashProvidedByUsedInOperatingActivities (4,434)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Additions to property, plant and equipment (19)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Net cash used for investing activities (19)us-gaap_NetCashProvidedByUsedInInvestingActivities  
Cash flows from financing activities:    
Principal payments on long-term debt (3)us-gaap_RepaymentsOfLongTermDebt (3)us-gaap_RepaymentsOfLongTermDebt
Net cash used for by financing activities (3)us-gaap_NetCashProvidedByUsedInFinancingActivities (3)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash and cash equivalents (2,658)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (4,437)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 16,206us-gaap_CashAndCashEquivalentsAtCarryingValue 11,887us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 13,548us-gaap_CashAndCashEquivalentsAtCarryingValue $ 7,450us-gaap_CashAndCashEquivalentsAtCarryingValue