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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Mar. 05, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38853    
Entity Registrant Name NGM BIOPHARMACEUTICALS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-1679911    
Entity Address, Address Line One 333 Oyster Point Boulevard    
Entity Address, City or Town South San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94080    
City Area Code 650    
Local Phone Number 243-5555    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol NGM    
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 false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 147
Entity Common Stock, Shares Outstanding   83,462,408  
Documents Incorporated By Reference
DOCUMENTS INCORPORATED BY REFERENCE
Certain information required by Part III, Items 10-14 of this Annual Report on Form 10-K is incorporated by reference to the registrant’s definitive Proxy Statement for the 2024 Annual Meeting of Stockholders to be filed with the U.S. Securities and Exchange Commission pursuant to Regulation 14A. If such Proxy Statement is not filed within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, such information will be included in an amendment to this Annual Report on Form 10-K to be filed within such 120-day period.
    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001426332