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Organization and Significant Accounting Policies, Noncontrolling Interest in Akcea Therapeutics, Inc. (Details) - Akcea [Member]
Oct. 31, 2020
Sep. 30, 2020
Jun. 30, 2017
Noncontrolling Interest in Akcea Therapeutics, Inc. [Abstract]      
Percentage ownership 100.00% 76.00% 100.00%
Minimum [Member]      
Noncontrolling Interest in Akcea Therapeutics, Inc. [Abstract]      
Percentage ownership 68.00%    
Maximum [Member]      
Noncontrolling Interest in Akcea Therapeutics, Inc. [Abstract]      
Percentage ownership 77.00%