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License Agreements and Services Agreement with Ionis, TTR Development, Commercialization, Collaboration and License Agreement (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 17, 2018
USD ($)
shares
Aug. 03, 2018
USD ($)
shares
Apr. 17, 2018
USD ($)
Milestone
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
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     125,000,000  
Intangible assets, net       $ 84,529   $ 84,529     $ 88,914  
Amortization expense of milestone payment       1,434 $ 701 4,256 $ 701      
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              
Notice period for termination of agreement           90 days        
Common stock shares issued to Ionis | shares     10,700,000              
Stock purchased by Ionis     $ 200,000              
Common stock, shares authorized (in shares) | shares     125,000,000             100,000,000
Intangible assets, net     $ 600              
Commercial inotersen inventory acquired from Ionis     $ 4,700              
Clinical material acquired from Ionis               $ 13,500    
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   $ 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] | 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 $ 40,000                
Amortization expense of milestone payment       $ 1,400 $ 700 $ 4,300 $ 700      
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