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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	1,759	616	1,558
Accrued payroll and related expenses	741	49	74
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

Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details