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Significant Accounting Policies, Revenue Recognition (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2013
USD ($)
Dec. 31, 2012
USD ($)
AccountingUnit
Target
Jun. 30, 2012
USD ($)
Jan. 31, 2012
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
Agreement
Category
Stage
Jun. 30, 2014
USD ($)
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Licensing and royalty revenue         $ 770,000 $ 448,000   $ 1,461,000 $ 9,060,000
Collaborations and Licensing Agreements [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
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]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               12 months  
Collaborations and Licensing Agreements [Member] | Development Milestones - New Development Candidate [Member] | Maximum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               18 months  
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 1 [Member] | Minimum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               1 year  
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 1 [Member] | Maximum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               2 years  
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 2 [Member] | Minimum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               1 year  
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 2 [Member] | Maximum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               3 years  
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 3 [Member] | Minimum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               2 years  
Collaborations and Licensing Agreements [Member] | Development Milestones - Phase 3 [Member] | Maximum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Completion period               4 years  
Collaborations and Licensing Agreements [Member] | Regulatory Milestones [Member] | Minimum [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
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]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Time to prepare and submit regulatory filings               12 months  
Time to obtain approval               2 years  
Collaborations and Licensing Agreements [Member] | Commercialization Milestones [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Pre-specified sales threshold               $ 1,000,000,000  
Bayer HealthCare [Member] | Agreement Entered into in May 2015 [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee received         100,000,000        
Number of units of accounting | AccountingUnit   3              
Bayer HealthCare [Member] | Agreement Entered into in May 2015 [Member] | ISIS-FXI [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee recognized         $ 91,200,000        
Assumed percentage change in estimated selling price         10.00%        
Percentage change in earned revenue based on assumed change in estimated selling price         1.00%        
Change in earned revenue based on assumed change in estimated selling price         $ 900,000        
Bayer HealthCare [Member] | Agreement Entered into in May 2015 [Member] | ISIS-FXI Development Services [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee recorded as deferred revenue         4,300,000        
Bayer HealthCare [Member] | Agreement Entered into in May 2015 [Member] | ISIS-FXI API [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee recorded as deferred revenue         $ 4,500,000        
Biogen Idec [Member] | Collaborations and Licensing Agreements [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Number of collaborative agreements | Agreement               4  
Biogen Idec [Member] | Agreement Entered into in January 2012 [Member] | ISIS-SMN [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee recorded as deferred revenue       $ 29,000,000          
Biogen Idec [Member] | Agreement Entered into in June 2012 [Member] | ISIS-DMPK [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee recorded as deferred revenue     $ 12,000,000            
Biogen Idec [Member] | Agreement Entered into in December 2012 [Member] | Neurology [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee recorded as deferred revenue   $ 30,000,000              
Number of targets | Target   3              
Biogen Idec [Member] | Agreement Entered into in September 2013 [Member] | Strategic Neurology [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Upfront fee recorded as deferred revenue $ 100,000,000                
Term of collaboration agreement               6 years  
Alnylam [Member]                  
Collaborative Arrangements and Licensing Agreements [Line Items]                  
Licensing and royalty revenue             $ 7,700,000