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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Mar. 09, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Period End Date Dec. 31, 2022    
Amendment Flag false    
Trading Symbol SGHT    
Entity Registrant Name SIGHT SCIENCES, INC.    
Entity Central Index Key 0001531177    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2022    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Shell Company false    
Entity Ex Transition Period false    
Document Fiscal Period Focus FY    
Entity Public Float     $ 290
Entity Common Stock, Shares Outstanding   48,419,542  
ICFR Auditor Attestation Flag false    
Entity File Number 001-40587    
Entity Tax Identification Number 80-0625749    
Entity Address, Address Line One 4040 Campbell Ave    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Menlo Park    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94025    
City Area Code 877    
Local Phone Number 266-1144    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common Stock, par value $0.001    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

Portions of the registrant's definitive Proxy Statement relating to its 2023 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year ended December 31, 2022 are incorporated herein by reference in Part III of this Annual Report on Form 10-K.

    
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Location San Jose, California    
Auditor Firm ID 34