Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Registrant Name EyePoint Pharmaceuticals, Inc.  
Entity Central Index Key 0001314102  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Trading Symbol EYPT  
Entity Common Stock, Shares Outstanding   106,297,792
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Shell Company false  
Entity File Number 000-51122  
Entity Tax Identification Number 262774444  
Entity Address, Address Line One 480 Pleasant Street  
Entity Address, City or Town Watertown  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 02472  
City Area Code (617)  
Local Phone Number 926-5000