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Cover
 9 Months Ended
Sep. 30, 2021
Cover [Abstract]  
Document Type S-1
Entity Registrant Name Semrush Holdings, Inc.
Entity Incorporation, State or Country Code DE
Entity Primary SIC Number 7372
Entity Tax Identification Number 84-4053265
Entity Address, Address Line One 800 Boylston Street, Suite 2475
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02199
City Area Code 800
Local Phone Number 851-9959
Entity Filer Category Non-accelerated Filer
Entity Small Business false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0001831840
Amendment Flag false