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Significant Accounting Policies, Basic and Diluted Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Basic Net Income (Loss) per Share [Abstract]          
Dividend rate       6.00%  
Conversion ratio     converted into common stock on a 1:1 basis    
Basic net income (loss) per share (in dollars per share) $ (0.03) $ (0.02) $ (0.33) $ 0.13  
Net income (loss) $ (4,559) $ (2,611) $ (46,335) $ 3,266  
Net income (loss) available to Ionis common shareholders $ (4,616) $ (1,976) $ (43,162) $ 16,321  
Shares used in computing basic net income (loss) per share (in shares) 143,314 124,370 132,518 123,746  
Income available to Ionis common shareholders, plus assumed conversions       $ 16,321  
Shares issuable related to our ESPP       24  
Shares used in computing diluted net income per share (in shares) 143,314 124,370 132,518 125,858  
Diluted net income per share (in dollars per share) $ (0.03) $ (0.02) $ (0.33) $ 0.13  
1 Percent Convertible Senior Notes [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Interest rate on convertible senior notes 1.00% 1.00% 1.00% 1.00% 1.00%
2 3/4 Percent Convertible Senior Notes [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Interest rate on convertible senior notes 2.75% 2.75% 2.75% 2.75%  
Stock Options [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Shares issuable related to stock-based compensation (in shares)       1,658  
Restricted Stock Awards [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Shares issuable related to stock-based compensation (in shares)       430  
Ionis [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Net income (loss) $ 43,226 $ 10,144 $ 67,517 $ 100,235  
Akcea [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Net income (loss) $ (47,843) $ (12,120) $ (110,680) $ (83,914)  
Akcea [Member] | Preferred Stock [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Weighted average shares owned in Akcea (in shares)   5,651   21,055  
Basic net income (loss) per share (in dollars per share)   $ (0.01)   $ (2.16)  
Net income (loss)   $ (57)   $ (45,479)  
Akcea [Member] | Common Stock [Member]          
Basic Net Income (Loss) per Share [Abstract]          
Weighted average shares owned in Akcea (in shares) 65,538 36,556 57,347 12,319  
Basic net income (loss) per share (in dollars per share) $ (0.73) $ (0.33) $ (1.93) $ (3.12)  
Net income (loss) $ (47,843) $ (12,063) $ (110,680) $ (38,435)