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Organization, Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Description Of Business [Line Items] |  |  |
Net loss | $ (15,491) | $ (11,951) |
Accumulated deficit | (483,514) |  | $ (468,023)
Cash, cash equivalents, restricted cash and available-for-sale investments | 87,700 |  |
Restricted cash | $ 3,214 | $ 3,190 | 3,484
Employee retention of payroll expenses |  |  | 1,200
Research and Development Expense [Member] |  |  |
Description Of Business [Line Items] |  |  |
Employee retention credit receivable - research and development expenses |  |  | 800
General and Administrative Expense [Member] |  |  |
Description Of Business [Line Items] |  |  |
Employee retention credit receivable - general and administrative expenses |  |  | $ 400
Pangu BioPharma [Member] | Hong Kong [Member] |  |  |
Description Of Business [Line Items] |  |  |
Majority-owned subsidiary percentage | 98.00% |  |

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