v3.26.1
Document and Entity Information
May 08, 2026
Entity Listings [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 08, 2026
Current Fiscal Year End Date --12-31
Entity File Number 001-38542
Entity Registrant Name Kezar Life Sciences, Inc.
Entity Central Index Key 0001645666
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 47-3366145
Entity Address, Address Line One 4000 Shoreline Court, Suite 300
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 822-5600
Entity Emerging Growth Company false
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Common Stock [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Common Stock, $0.001 par value per share
Trading Symbol KZR
Security Exchange Name NASDAQ
Preferred Share Purchase Rights [Member]  
Entity Listings [Line Items]  
Title of 12(b) Security Preferred Share Purchase Rights
Security Exchange Name NASDAQ