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Accrued Expenses - Schedule of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Payables and Accruals [Abstract]      
Accrued licensing milestones fees $ 6,700zfgn_AccruedLicensingMilestones    
Accrued research and development expenses 1,759zfgn_AccruedResearchAndDevelopmentExpenseCurrent 616zfgn_AccruedResearchAndDevelopmentExpenseCurrent 1,558zfgn_AccruedResearchAndDevelopmentExpenseCurrent
Accrued payroll and related expenses 741us-gaap_EmployeeRelatedLiabilitiesCurrent 49us-gaap_EmployeeRelatedLiabilitiesCurrent 74us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued professional fees 542us-gaap_AccruedProfessionalFeesCurrent 196us-gaap_AccruedProfessionalFeesCurrent 62us-gaap_AccruedProfessionalFeesCurrent
Accrued interest 51zfgn_AccruedInterestExpense    
Accrued other 92us-gaap_OtherAccruedLiabilitiesCurrent 39us-gaap_OtherAccruedLiabilitiesCurrent 5us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses $ 9,885us-gaap_AccruedLiabilitiesCurrent $ 900us-gaap_AccruedLiabilitiesCurrent $ 1,699us-gaap_AccruedLiabilitiesCurrent