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Supplemental Balance Sheet Information - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory [Line Items]    
Raw materials $ 81,132 $ 74,442
Work-in-process 370,148 349,978
Finished goods 292,572 255,855
Total inventory 743,852 $ 680,275 [1]
Pre-Launch Valoctocogene Roxaparvovec    
Inventory [Line Items]    
Total inventory $ 72,400  
[1] December 31, 2019 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on February 27, 2020.