Segment and Other Information - Summary of Net Sales by Medicine (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
UPLIZNA [Member]
Segment Reporting Information [Line Items]
Revenues	$ 11.2	$ 4.1

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details