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License Agreements and Services Agreement with Ionis, TTR Development, Commercialization, Collaboration and License Agreement (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 17, 2018
USD ($)
shares
Aug. 03, 2018
USD ($)
shares
Apr. 17, 2018
USD ($)
Milestone
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2019
USD ($)
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Intangible assets, net       $ 81,589     $ 83,051
Amortization expense of intangible assets       1,419 $ 1,403    
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 license 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      
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] | Ionis Stock Purchase Agreement [Member]              
TTR Development, Commercialization, Collaboration and License Agreement [Abstract]              
Common stock shares issued to Ionis | shares           10,700,000  
Stock purchased by Ionis           $ 200,000  
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      
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      
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      
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 intangible assets       $ 1,400 $ 1,400    
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