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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - Segment | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 12, 2019
Summary Of Significant Accounting Policies [Line Items] |  |
Number of operating segments | 1 |
Change in accounting principle, accounting standards update, adopted | true |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |
Change in accounting principle, accounting standards update, immaterial effect | true |
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Casebia Therapeutics Limited Liability Partnership [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Equity method investment, ownership percentage |  | 50.00%

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