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Segment, Revenue and Geographic Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Number of reportable segments \| segment	1
Customer Concentration Risk \| Sales \| Non-US
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	17.00%	13.00%	33.00%
Customer Concentration Risk \| Sales \| CHINA
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	3.00%	4.00%	13.00%
Geographic Concentration Risk \| Non-US
Revenue, Major Customer [Line Items]
Accounts receivable	$ 53.5	$ 18.6
Product Concentration Risk \| Sales \| Influenza Products
Revenue, Major Customer [Line Items]
Percentage of risk concentration by major customer	4.00%	8.00%	26.00%
Credit Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable	$ 267.3	$ 411.7