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Document and Entity Information
Jan. 30, 2024
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jan. 30, 2024
Entity Registrant Name Arcellx, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-41259
Entity Tax Identification Number 47-2855917
Entity Address Address Line 1 800 Bridge Parkway
Entity Address City Or Town Redwood City
Entity Address State Or Province CA
Entity Address Postal Zip Code 94065
City Area Code 240
Local Phone Number 327-0603
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.001 par value per share
Trading Symbol ACLX
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001786205
Amendment Flag false
Former Address [Member]  
Document And Entity Information [Line Items]  
Entity Address Address Line 1 25 West Watkins Mill Road
Entity Address Address Line 2 Suite A
Entity Address City Or Town Gaithersburg
Entity Address State Or Province MD
Entity Address Postal Zip Code 20878