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License Agreements and Services Agreement with Ionis, TTR Development, Commercialization, Collaboration and License Agreement (Details)
3 Months Ended
Oct. 17, 2018
USD ($)
shares
Aug. 03, 2018
USD ($)
shares
Apr. 17, 2018
USD ($)
Milestone
shares
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
shares
Apr. 16, 2018
shares
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Common stock, shares authorized (in shares) | shares       125,000,000   125,000,000  
Intangible assets, net       $ 87,468,000   $ 88,914,000  
Amortization expense of milestone payment       $ 1,403,000      
Ionis [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Costs incurred by Ionis prior to closing of TTR Agreement     $ 3,100,000        
Ionis [Member] | TTR License Agreement [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Upfront licensing fee paid to Ionis     $ 150,000,000        
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     $ 750,000,000        
Notice period for termination of agreement       90 days      
Common stock shares issued to Ionis | shares     10,700,000        
Stock purchased by Ionis     $ 200,000,000        
Common stock, shares authorized (in shares) | shares     125,000,000       100,000,000
Intangible assets, net     $ 600,000        
Commercial inotersen inventory acquired from Ionis     $ 4,700,000        
Clinical material acquired from Ionis       $ 13,500,000      
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%        
Ionis [Member] | TTR License Agreement [Member] | Inotersen [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Maximum amount of payments payable for milestones       110,000,000      
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       145,000,000      
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       1,300,000,000      
Ionis [Member] | TTR License Agreement [Member] | TEGSEDI [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Common stock shares issued to Ionis | shares 1,671,849 1,597,571          
Amount of regulatory approval milestone paid by issuing common stock $ 50,000,000 $ 40,000,000          
Amortization expense of milestone payment       $ 1,400,000 $ 0    
Ionis [Member] | TTR License Agreement [Member] | TEGSEDI [Member] | Milestone Payment [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Useful life of milestone payment amortized to cost of sales       16 years