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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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