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Fair value of financial instruments and marketable securities (Details 4) (Warrants, USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Changes in the fair value of warrant liability |  |
Beginning balance | $ 188 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |
Change in fair value of warrant liability | 41 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings |
Ending balance | $ 229 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |
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 | 68.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Risk-free interest rate (as a percent) | 0.56%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.89%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Strike price (in dollars per share) | $ 128 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 128 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Expected life | 2 years 2 months 16 days | 2 years 6 months
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 | 70.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Risk-free interest rate (as a percent) | 1.13%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.65%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Strike price (in dollars per share) | $ 2,520 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 2,520 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Expected life | 4 years 5 months 23 days | 4 years 8 months 12 days
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) | $ 60.85 us-gaap_SharePrice / us-gaap_FairValueByLiabilityClassAxis = us-gaap_WarrantMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 51.77 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 Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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 Risk-free interest rate assumption used in valuing an instrument. + 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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- Definition Fair value of 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) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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