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Significant Accounting Policies, Revenue Recognition (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2013
USD ($)
Dec. 31, 2012
USD ($)
Target
Jun. 30, 2012
USD ($)
Jan. 31, 2012
USD ($)
Mar. 31, 2016
USD ($)
AccountingUnit
Agreement
Category
Stage
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Revenue Recognition [Abstract]                
Revenue earned         $ 36,874,000   $ 62,583,000  
Licensing and royalty revenue         $ 1,660,000   691,000  
Collaborations and Licensing Agreements [Member]                
Revenue Recognition [Abstract]                
Number of categories of milestone events | Category         3      
Number of stages of life-cycle of drugs | Stage         3      
Collaborations and Licensing Agreements [Member] | Development Milestones - New Development Candidate [Member] | Minimum [Member]                
Revenue Recognition [Abstract]                
Completion period         12 months      
Collaborations and Licensing Agreements [Member] | Development Milestones - New Development Candidate [Member] | Maximum [Member]                
Revenue Recognition [Abstract]                
Completion period         18 months      
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 1 [Member] | Minimum [Member]                
Revenue Recognition [Abstract]                
Completion period         1 year      
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 1 [Member] | Maximum [Member]                
Revenue Recognition [Abstract]                
Completion period         2 years      
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 2 [Member] | Minimum [Member]                
Revenue Recognition [Abstract]                
Completion period         1 year      
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 2 [Member] | Maximum [Member]                
Revenue Recognition [Abstract]                
Completion period         3 years      
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 3 [Member] | Minimum [Member]                
Revenue Recognition [Abstract]                
Completion period         2 years      
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 3 [Member] | Maximum [Member]                
Revenue Recognition [Abstract]                
Completion period         4 years      
Collaborations and Licensing Agreements [Member] | Regulatory Milestones [Member] | Minimum [Member]                
Revenue Recognition [Abstract]                
Time to prepare and submit regulatory filings         6 months      
Time to obtain approval         1 year      
Collaborations and Licensing Agreements [Member] | Regulatory Milestones [Member] | Maximum [Member]                
Revenue Recognition [Abstract]                
Time to prepare and submit regulatory filings         12 months      
Time to obtain approval         2 years      
Collaborations and Licensing Agreements [Member] | Commercialization Milestones [Member] | Minimum [Member]                
Revenue Recognition [Abstract]                
Pre-specified sales threshold         $ 1,000,000,000      
Bayer [Member] | Agreement Entered into in May 2015 [Member]                
Revenue Recognition [Abstract]                
Upfront fee received           $ 100,000,000    
Number of units of accounting | AccountingUnit         3      
Bayer [Member] | Agreement Entered into in May 2015 [Member] | IONIS-FXI [Member]                
Revenue Recognition [Abstract]                
Upfront fee recognized           91,200,000    
Upfront payment recorded as deferred revenue           $ 4,300,000    
Assumed percentage change in estimated selling price           10.00%    
Percentage change in earned revenue based on assumed change in estimated selling price           1.00%    
Amount by which earned revenue would change based on assumed change in estimated selling price           $ 900,000    
Bayer [Member] | Agreement Entered into in May 2015 [Member] | IONIS-FXI Active Pharmaceutical Ingredient [Member]                
Revenue Recognition [Abstract]                
Upfront payment recorded as deferred revenue           $ 4,500,000    
Revenue earned         $ 400,000      
Biogen [Member] | Collaborations and Licensing Agreements [Member]                
Revenue Recognition [Abstract]                
Revenue earned         $ 21,300,000   $ 39,200,000  
Number of collaboration agreements | Agreement         4      
Biogen [Member] | Agreement Entered into in January 2012 [Member] | Nusinersen [Member]                
Revenue Recognition [Abstract]                
Upfront payment recorded as deferred revenue       $ 29,000,000        
Biogen [Member] | Agreement Entered into in June 2012 [Member] | IONIS-DMPK-2.5 [Member]                
Revenue Recognition [Abstract]                
Upfront payment recorded as deferred revenue     $ 12,000,000          
Biogen [Member] | Agreement Entered into in December 2012 [Member] | Neurology [Member]                
Revenue Recognition [Abstract]                
Upfront payment recorded as deferred revenue   $ 30,000,000            
Number of targets | Target   3            
Biogen [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member]                
Revenue Recognition [Abstract]                
Upfront payment recorded as deferred revenue $ 100,000,000              
Term of collaboration agreement         6 years      
Alnylam [Member]                
Revenue Recognition [Abstract]                
Licensing and royalty revenue               $ 9,500,000