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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 | $ 1,230 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | $ 1,237 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | $ 630 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Unrealized foreign currency exchange (gains) losses | 31 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 169 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 250 us-gaap_ForeignCurrencyTransactionGainLossUnrealized |
Tax incentive receivable | 1,218 us-gaap_IncomeTaxesReceivable |  | 1,617 us-gaap_IncomeTaxesReceivable |
Australia [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax incentive receivable | 1,218 us-gaap_IncomeTaxesReceivable / us-gaap_StatementGeographicalAxis = country_AU |  | 1,617 us-gaap_IncomeTaxesReceivable / us-gaap_StatementGeographicalAxis = country_AU | 630 us-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 | $ 31 us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_IncomeTaxAuthorityAxis = zfgn_TaxIncentiveMember | $ 169 us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_IncomeTaxAuthorityAxis = zfgn_TaxIncentiveMember | $ 250 us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_IncomeTaxAuthorityAxis = zfgn_TaxIncentiveMember |

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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(a)(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Subparagraph c -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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