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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 6 Months Ended 7 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jul. 31, 2017
Jul. 18, 2017
Dec. 31, 2017
Basic Net Income (Loss) per Share [Abstract]                
Basic net income (loss) per share (in dollars per share) $ (0.29) $ (0.02)   $ (0.30) $ 0.05      
Net income (loss) $ (40,358) $ (3,085)   $ (41,775) $ 5,878      
Net income (loss) available to Ionis common shareholders $ (37,932)     $ (38,530) $ 5,878      
Shares used in computing basic net income (loss) per share (in shares) 128,712 123,989   127,030 123,428      
Income available to Ionis common shareholders, plus assumed conversions         $ 5,878      
Shares issuable related to our ESPP         23      
Shares used in computing diluted net income per share (in shares) 128,712 123,989   127,030 125,511      
Diluted net income per share (in dollars per share) $ (0.29) $ (0.02)   $ (0.30) $ 0.05      
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)         1,659      
Restricted Stock Awards [Member]                
Basic Net Income (Loss) per Share [Abstract]                
Shares issuable related to stock-based compensation (in shares)         401      
Ionis [Member]                
Basic Net Income (Loss) per Share [Abstract]                
Net income (loss) $ 5,882     $ 24,668        
Akcea [Member]                
Basic Net Income (Loss) per Share [Abstract]                
Net income (loss) $ (43,814)     $ (63,198)        
Percentage ownership     100.00%   100.00% 100.00% 100.00%  
Akcea [Member] | Common Stock [Member]                
Basic Net Income (Loss) per Share [Abstract]                
Weighted average shares owned in Akcea (in shares) 60,832     53,183        
Basic net income (loss) per share (in dollars per share) $ (0.72)     $ (1.19)        
Net income (loss) $ (43,814)     $ (63,198)