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Document and Entity Information
Sep. 15, 2025
Cover [Abstract]  
Entity Registrant Name CYTOKINETICS INC
Amendment Flag false
Entity Central Index Key 0001061983
Document Type 8-K
Document Period End Date Sep. 15, 2025
Entity Incorporation State Country Code DE
Entity File Number 000-50633
Entity Tax Identification Number 94-3291317
Entity Address, Address Line One 350 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 624-3000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.001
Trading Symbol CYTK
Security Exchange Name NASDAQ
Entity Emerging Growth Company false