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Net Loss Per Share (Details 1)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted-average anti-dilutive common shares 10,103us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 10,664us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted-average anti-dilutive common shares 6,823us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
6,697us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
Warrants [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted-average anti-dilutive common shares 3,280us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
3,967us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember