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Document and Entity Information
Dec. 14, 2023
Cover [Abstract]  
Entity Registrant Name Syndax Pharmaceuticals Inc
Amendment Flag false
Entity Central Index Key 0001395937
Document Type 8-K
Document Period End Date Dec. 14, 2023
Entity Incorporation State Country Code DE
Entity File Number 001-37708
Entity Tax Identification Number 32-0162505
Entity Address, Address Line One Building D
Entity Address, Address Line Two Floor 3
Entity Address, Address Line Three 35 Gatehouse Drive
Entity Address, City or Town Waltham
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02451
City Area Code (781)
Local Phone Number 419-1400
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock
Trading Symbol SNDX
Security Exchange Name NASDAQ
Entity Emerging Growth Company false