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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Mar. 20, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-36751    
Entity Registrant Name OCUGEN, INC.    
Entity Central Index Key 0001372299    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 04-3522315    
Entity Address, Address Line One 5 Great Valley Parkway, Suite 160    
Entity Address, City or Town Malvern,    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19355    
City Area Code 484    
Local Phone Number 328-4701    
Title of 12(b) Security Common Stock    
Trading Symbol OCGN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 18.1
Entity Common Stock, Shares Outstanding   52,625,228  
Documents Incorporated by Reference [Text Block]
DOCUMENTS INCORPORATED BY REFERENCE

Part III of this Annual Report on Form 10-K incorporates certain information by reference from the registrant’s proxy statement for the 2020 annual meeting of stockholders to be filed no later than 120 days after the end of the registrant’s fiscal year ended December 31, 2019.