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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - Collaboration and License Agreement [Member] - Swedish Orphan Biovitrum AB (Publ) [Member] - USD ($)
$ in Millions
Nov. 02, 2020
Oct. 27, 2020
Subsequent Event [Line Items]    
Upfront Payment $ 250 $ 250
Development cost reimbursement   $ 80
Royalties entitled to receive after first commercial sale of applicable licensed product period   10 years
Execution period of collaboration agreement   10 days
Maximum [Member]    
Subsequent Event [Line Items]    
Aggregate milestone payments upon achievement of specified one-time regulatory and commercial milestone events   $ 915