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Cover page - USD ($)
 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 001-37985    
Entity Registrant Name ANAPTYSBIO, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-3828755    
Entity Address, Address Line One 10770 Wateridge Circle    
Entity Address, Address Line Two Suite 210    
Entity Address, City or Town San Diego    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92121    
City Area Code 858    
Local Phone Number 362-6295    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol ANAB    
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     $ 366,560,992
Entity Common Stock, Shares Outstanding   26,763,081  
Documents Incorporated by Reference
Portions of the registrant’s Definitive Proxy Statement relating to the 2024 Annual Meeting of Stockholders, scheduled to be held on June 12, 2024, 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, 2023. 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.
    
Entity Central Index Key 0001370053    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false