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License Agreements and Services Agreement with Ionis, TTR Development, Commercialization, Collaboration and License Agreement (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 17, 2018
USD ($)
Milestone
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Apr. 16, 2018
shares
Dec. 31, 2017
USD ($)
shares
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Common stock, shares authorized (in shares) | shares   125,000,000   125,000,000     100,000,000
Licenses, net   $ 1,714   $ 1,714     $ 1,221
Research and development expense   39,457 $ 18,487 67,427 $ 83,282    
TTR License Agreement [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Research and development expense   11,900   $ 11,900      
Ionis [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Costs incurred by Ionis prior to closing of TTR Agreement $ 3,100            
Ionis [Member] | TTR License Agreement [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Upfront licensing fee paid to Ionis $ 150,000            
Shares issued in consideration of upfront licensing fee (in shares) | shares 8,000,000            
Number of sales milestones | Milestone 7            
Annual worldwide net sales required for subsequent milestone payments to be paid in cash $ 750,000            
Percentage of profits and losses from development and commercialization of inotersen paid to Ionis, tier 1 60.00%            
Percentage of profits and losses from development and commercialization of inotersen retained, tier 1 40.00%            
Percentage of profits and losses from development and commercialization of inotersen paid to Ionis, tier 2 50.00%            
Percentage of profits and losses from development and commercialization of inotersen retained, tier 2 50.00%            
Percentage of profits and losses from development and commercialization of AKCEA-TTR-L paid to Ionis 50.00%            
Percentage of profits and losses from development and commercialization of AKCEA-TTR-L retained 50.00%            
Notice period for termination of agreement       90 days      
Shares purchased by Ionis (in shares) | shares 10,700,000            
Stock purchased by Ionis $ 200,000            
Common stock, shares authorized (in shares) | shares 125,000,000         100,000,000  
Licenses, net $ 600            
Commercial inotersen inventory acquired from Ionis $ 4,700            
Ionis [Member] | TTR License Agreement [Member] | Inotersen [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Maximum amount of payments payable for milestones   110,000   $ 110,000      
Ionis [Member] | TTR License Agreement [Member] | AKCEA-TTR-L [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Maximum amount of payments payable for milestones   145,000   145,000      
Ionis [Member] | TTR License Agreement [Member] | Inotersen and AKCEA-TTR-L [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Maximum amount of payments payable for milestones   $ 1,300,000   $ 1,300,000      
Ionis [Member] | Akcea [Member]              
Noncontrolling Interest [Line Items]              
Ownership percentage by Ionis 75.00% 75.00%   75.00%