v3.19.3.a.u2
Document and Entity Information
Jan. 09, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jan. 09, 2020
Entity Registrant Name IONIS PHARMACEUTICALS, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 000-19125
Entity Tax Identification Number 33-0336973
Entity Address, Address Line One 2855 Gazelle Court
Entity Address, City or Town Carlsbad
Entity Address, State or Province CA
Entity Address, Postal Zip Code 92010
City Area Code 760
Local Phone Number 931-9200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000874015
Title of 12(b) Security Common Stock, $.001 Par Value
Trading Symbol IONS
Security Exchange Name NASDAQ