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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]      
Revenue $ 1,249us-gaap_RoyaltyRevenue $ 2,197us-gaap_RoyaltyRevenue $ 412us-gaap_RoyaltyRevenue
Operating expense:      
Royalty expense 6,100us-gaap_RoyaltyExpense 0us-gaap_RoyaltyExpense 0us-gaap_RoyaltyExpense
Research and development 2,004us-gaap_ResearchAndDevelopmentExpense 1,782us-gaap_ResearchAndDevelopmentExpense 1,555us-gaap_ResearchAndDevelopmentExpense
General, selling and administrative 28,310us-gaap_SellingGeneralAndAdministrativeExpense 29,002us-gaap_SellingGeneralAndAdministrativeExpense 37,718us-gaap_SellingGeneralAndAdministrativeExpense
Gain on settlement (Note 3) (23,000)us-gaap_GainLossRelatedToLitigationSettlement 0us-gaap_GainLossRelatedToLitigationSettlement 0us-gaap_GainLossRelatedToLitigationSettlement
Total operating expense 13,414us-gaap_OperatingExpenses 30,784us-gaap_OperatingExpenses 39,273us-gaap_OperatingExpenses
Loss from operations (12,165)us-gaap_OperatingIncomeLoss (28,587)us-gaap_OperatingIncomeLoss (38,861)us-gaap_OperatingIncomeLoss
Gain (loss) on change in value of embedded derivative and warrants 2,238us-gaap_UnrealizedGainLossOnDerivatives 1,608us-gaap_UnrealizedGainLossOnDerivatives (927)us-gaap_UnrealizedGainLossOnDerivatives
Interest income, net 40us-gaap_InterestAndOtherIncome 122us-gaap_InterestAndOtherIncome 329us-gaap_InterestAndOtherIncome
Loss before taxes (9,887)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (26,857)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (39,459)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (expense) benefit (15)us-gaap_IncomeTaxExpenseBenefit (751)us-gaap_IncomeTaxExpenseBenefit 12,535us-gaap_IncomeTaxExpenseBenefit
Net loss $ (9,902)us-gaap_NetIncomeLoss $ (27,608)us-gaap_NetIncomeLoss $ (26,924)us-gaap_NetIncomeLoss
Basic and diluted loss per share: (in dollars per share) $ (0.19)us-gaap_EarningsPerShareBasicAndDiluted $ (0.54)us-gaap_EarningsPerShareBasicAndDiluted $ (0.53)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average shares outstanding basic and diluted (in shares) 51,570,472us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 51,188,006us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 50,934,266us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted