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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) |  |  | $ 15.00 us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Warrant |  |  |
Changes in the fair value of warrant liability |  |  |
Beginning balance | $ 58 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember | $ 96 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |
Change in fair value of warrant liability | 130 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember | (38)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember |
Ending balance | $ 188 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember | $ 58 us-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) | $ 128.00 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 128.00 us-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) | $ 2,520.00 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 2,520.00 us-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) | $ 51.77 us-gaap_SharePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 16.97 us-gaap_SharePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |

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- Definition Agreed upon price for the exchange of the underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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