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Document and Entity Information | 9 Months Ended
--- | ---
Sep. 30, 2014
Document And Entity Information [Abstract] |
Document Type | S-1
Amendment Flag | false
Document Period End Date | Sep. 30, 2014
Trading Symbol | ZFGN
Entity Registrant Name | Zafgen, Inc.
Entity Central Index Key | 0001374690
Entity Filer Category | Non-accelerated Filer

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