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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 21, 2025
Jun. 28, 2024
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Annual Report true      
Document Transition Report false      
Document Period End Date Dec. 31, 2024      
Document Fiscal Year Focus 2024      
Document Fiscal Period Focus FY      
Current Fiscal Year End Date --12-31      
Entity Registrant Name ARCELLX, INC.      
Entity Central Index Key 0001786205      
Entity Public Float       $ 2.6
Entity File Number 001-41259      
Entity Tax Identification Number 47-2855917      
Title of 12(b) Security Common Stock, $0.001 par value per share      
Trading Symbol ACLX      
Security Exchange Name NASDAQ      
Auditor Location San Jose, California Tysons, Virginia    
Entity Well-known Seasoned Issuer Yes      
Entity Voluntary Filers No      
Document Financial Statement Error Correction Flag false      
Auditor Name PricewaterhouseCoopers LLP Ernst & Young LLP    
Entity Current Reporting Status Yes      
Entity Interactive Data Current Yes      
ICFR Auditor Attestation Flag true      
Auditor Firm ID 238 42    
Entity Shell Company false      
Entity Filer Category Large Accelerated Filer      
Entity Small Business false      
Entity Emerging Growth Company false      
Entity Incorporation, State or Country Code DE      
Entity Address, Address Line One 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 327-0630      
Entity Common Stock, Shares Outstanding     54,944,012  
Documents Incorporated by Reference [Text Block]

Portions of the Registrant’s definitive Proxy Statement to be filed with the Securities and Exchange Commission in connection with the Registrant’s 2025 Annual Meeting of Stockholders, which will be filed subsequent to the date hereof, are incorporated by reference into Part III of this Form 10-K. Such Proxy Statement will be filed with the Securities and Exchange Commission not later than 120 days following the end of the Registrant’s fiscal year ended December 31, 2024. Except with respect to information specifically incorporated by reference, the Proxy Statement is not deemed to be filed as part of this Annual Report on Form 10-K.

     
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheet of Arcellx, Inc. and its subsidiary (the "Company") as of December 31, 2024, and the related consolidated statements of operations and comprehensive loss, of redeemable convertible preferred stock and stockholders’ equity (deficit) and of cash flows for the year then ended, including the related notes (collectively referred to as the "consolidated financial statements"). We also have audited the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and the results of its operations and its cash flows for the year then ended, in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheet of Arcellx, Inc. (the Company) as of December 31, 2023, the related consolidated statements of operations and comprehensive loss, redeemable convertible preferred stock and stockholders’ equity (deficit) and cash flows for each of the two years in the period ended December 31, 2023, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2023, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2023, in conformity with U.S. generally accepted accounting principles.