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Fair value of financial instruments and investments (Details 4) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Common stock      
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model      
Fair value of shares (in dollars per share)     $ 15.00us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Warrant      
Changes in the fair value of warrant liability      
Beginning balance $ 58us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
$ 96us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
 
Change in fair value of warrant liability 130us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
(38)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
 
Ending balance $ 188us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
$ 58us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
 
Warrant | Minimum      
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model      
Volatility (as a percent) 68.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
61.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Risk-free interest rate (as a percent) 0.89%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.07%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Strike price (in dollars per share) $ 128.00us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 128.00us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Expected life 2 years 6 months 3 months 18 days  
Warrant | Maximum      
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model      
Volatility (as a percent) 70.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
89.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Risk-free interest rate (as a percent) 1.65%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
2.10%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Strike price (in dollars per share) $ 2,520.00us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 2,520.00us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Expected life 4 years 8 months 12 days 5 years 8 months 12 days  
Warrant | Common stock      
Assumption used to estimate the fair value of warrant liability by utilizing the Black-Scholes option-pricing model      
Fair value of shares (in dollars per share) $ 51.77us-gaap_SharePrice
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 16.97us-gaap_SharePrice
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_WarrantMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember