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DOCUMENT AND ENTITY INFORMATION
 9 Months Ended
Sep. 30, 2022
shares
Cover [Abstract]  
Entity Registrant Name GERON CORP
Entity Central Index Key 0000886744
Document Type 10-Q
Document Period End Date Sep. 30, 2022
Amendment Flag false
Current Fiscal Year End Date --12-31
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Entity Common Stock, Shares Outstanding 381,235,046
Document Fiscal Year Focus 2022
Document Fiscal Period Focus Q3
Trading Symbol GERN
Entity File Number 000-20859
Entity Tax Identification Number 75-2287752
Entity Shell Company false
Entity Address, Address Line One 919 EAST HILLSDALE BOULEVARD
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 Quarterly Report true
Document Transition Report false