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Australia Research and Development Tax Incentive - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Percentage of refundable tax incentive	45.00%zfgn_EffectiveIncomeTaxRateReconciliationTaxRefundsRelatedToResearchAndDevelopment		45.00%zfgn_EffectiveIncomeTaxRateReconciliationTaxRefundsRelatedToResearchAndDevelopment
Reduction to research and development expenses	$ (368)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable	$ 1,230us-gaap_IncreaseDecreaseInIncomeTaxesReceivable	$ 1,237us-gaap_IncreaseDecreaseInIncomeTaxesReceivable	$ 630us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Unrealized foreign currency exchange (gains) losses	31us-gaap_ForeignCurrencyTransactionGainLossUnrealized	169us-gaap_ForeignCurrencyTransactionGainLossUnrealized	250us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Tax incentive receivable	1,218us-gaap_IncomeTaxesReceivable		1,617us-gaap_IncomeTaxesReceivable
Australia [Member]
Operating Loss Carryforwards [Line Items]
Tax incentive receivable	1,218us-gaap_IncomeTaxesReceivable / us-gaap_StatementGeographicalAxis = country_AU		1,617us-gaap_IncomeTaxesReceivable / us-gaap_StatementGeographicalAxis = country_AU	630us-gaap_IncomeTaxesReceivable / us-gaap_StatementGeographicalAxis = country_AU
Percentage of reduction in research and development costs	45.00%zfgn_PercentageReductionResearchAndDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_AU		45.00%zfgn_PercentageReductionResearchAndDevelopmentCosts / us-gaap_StatementGeographicalAxis = country_AU
Tax Incentive [Member]
Operating Loss Carryforwards [Line Items]
Unrealized foreign currency exchange (gains) losses	$ 31us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_IncomeTaxAuthorityAxis = zfgn_TaxIncentiveMember	$ 169us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_IncomeTaxAuthorityAxis = zfgn_TaxIncentiveMember	$ 250us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_IncomeTaxAuthorityAxis = zfgn_TaxIncentiveMember

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- Definition

Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

+ References

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Percentage of research and development costs eligible to be refunded as part of tax incentive program.

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Percentage Reduction Research And Development Costs

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