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Document and Entity Information
Jul. 25, 2022
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001501697
Document Type 8-K
Document Period End Date Jul. 25, 2022
Entity Registrant Name X4 PHARMACEUTICALS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-38295
Entity Tax Identification Number 27-3181608
Entity Address, Address Line One 61 North Beacon Street
Entity Address, Address Line Two 4th Floor
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02134
City Area Code (857)
Local Phone Number 529-8300
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.001 per share
Trading Symbol XFOR
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period true