v3.19.3.a.u2
Document and Entity Information
Feb. 14, 2020
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001501989
Document Type 8-K
Document Period End Date Feb. 14, 2020
Entity Registrant Name CYTOMX THERAPEUTICS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-37587
Entity Tax Identification Number 27-3521219
Entity Address, Address Line One 151 Oyster Point
Entity Address, Address Line Two Blvd.
Entity Address, Address Line Three Suite 400
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 515-3185
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.00001 par value per share
Trading Symbol CTMX
Security Exchange Name NASDAQ
Entity Emerging Growth Company false