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Equity Method and Other Investments in Equity Method Investees - Additional Information (Detail)	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2021 shares	Oct. 31, 2019 USD ($) Director	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Nov. 01, 2021	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
LianBio | Equity Method Investee's IPO | Subsequent Event
Schedule Of Equity Method Investments [Line Items]
Ownership interest							4.70%
LianBio | Common Stock
Schedule Of Equity Method Investments [Line Items]
Ownership interest			6.00%		6.00%			6.00%
Bridge Bio Pharma Limited Liability Company | Entities Affiliated With Perceptive Life Sciences Master Fund Ltd | LianBio
Schedule Of Equity Method Investments [Line Items]
Ownership interest		10.00%							10.00%
Number of directors appoint or removal | Director		1
Ownership interest, value		$ 3,800,000							$ 0
Impairments related investment			$ 0	$ 0	$ 0	$ 0
Warrant to purchase percentage		10.00%
Bridge Bio Pharma Limited Liability Company | Entities Affiliated With Perceptive Life Sciences Master Fund Ltd | LianBio | Subsequent Event
Schedule Of Equity Method Investments [Line Items]
Warrants to purchase common stock | shares	347,569
PellePharm, Inc
Schedule Of Equity Method Investments [Line Items]
Ownership interest, value								$ 0		$ 0
Impairments related investment			$ 0	$ 0
Preferred stock ownership percentage					61.90%
Equity security investment									$ 0

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