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Notes Payable - Schedule of Estimated Future Principal Payments Due under Term Loan (Detail) (Term Loan A [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Term Loan A [Member]
Line of Credit Facility [Line Items]
Remainder of 2014
2015	1,381us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_DebtInstrumentAxis = zfgn_TermLoanAMember
2016	2,936us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_DebtInstrumentAxis = zfgn_TermLoanAMember
2017	3,183us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_DebtInstrumentAxis = zfgn_TermLoanAMember
Total	$ 7,500us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = zfgn_TermLoanAMember

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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