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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 26, 2021
Sep. 25, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol GRAY    
Entity Registrant Name GRAYBUG VISION, INC.    
Entity Central Index Key 0001534133    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Common Stock, Shares Outstanding   21,043,984  
Entity File Number 001-39538    
Entity Tax Identification Number 45-2120079    
Entity Address, Address Line One 275 Shoreline Drive    
Entity Address, Address Line Two Suite 450    
Entity Address, City or Town Redwood City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94065    
City Area Code 650    
Local Phone Number 487-2800    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 120,200,000
ICFR Auditor Attestation Flag false    
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement relating to the 2021 Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein. The Definitive Proxy Statement will be filed within 120 days of the Registrant’s fiscal year ended December 31, 2020. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.