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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 02, 2022
Jun. 30, 2021
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-38501    
Entity Registrant Name SCHOLAR ROCK HOLDING CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 82-3750435    
Entity Address, Address Line One 301 Binney Street, 3rd Floor    
Entity Address, City or Town Cambridge    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02142    
City Area Code 857    
Local Phone Number 259-3860    
Title of 12(b) Security Common Stock    
Trading Symbol SRRK    
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 true    
Entity Ex Transition Period true    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 531.8
Entity Common Stock, Shares Outstanding   35,297,455  
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location Boston, Massachusetts    
Entity Central Index Key 0001727196    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false