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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitment, Contingency And Related Party Transactions [Abstract]
Related party transaction, expenses from transactions with related party	$ 80us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	$ 80us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	$ 18us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Related party transaction, revenues from transactions with related party		$ 500us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	zfgn_CommitmentContingencyAndRelatedPartyTransactionsAbstract
Namespace Prefix:	zfgn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration