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DOCUMENT AND ENTITY INFORMATION - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 30, 2024
Cover [Abstract]      
Entity Registrant Name GERON CORP    
Entity Central Index Key 0000886744    
Document Type 10-K    
Document Period End Date Dec. 31, 2024    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Public Float     $ 2,430,700,000
Entity Common Stock, Shares Outstanding   636,904,470  
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol GERN    
Entity File Number 000-20859    
Entity Tax Identification Number 75-2287752    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Address, Address Line One 919 East Hillsdale Blvd.    
Entity Address, Address Line Two Suite 250    
Entity Address, City or Town Foster City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94404    
City Area Code 650    
Local Phone Number 473-7700    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, $0.001 par value    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location San Jose, California    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE:

 

Document

 

Form 10‑K
Parts

Portions of the Registrant’s definitive proxy statement for the 2025 annual meeting of stockholders to be filed pursuant to Regulation 14A within 120 days of the Registrant’s fiscal year ended December 31, 2024.

 

III
   
Auditor Opinion [Text Block]

Opinion on the Financial Statements

 

We have audited the accompanying consolidated balance sheets of Geron Corporation (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive loss, stockholders' equity and cash flows for each of the three years in the period ended December 31, 2024 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 at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.

 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 26, 2025 expressed an unqualified opinion thereon.