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Collaboration and License Agreement with Genentech, Inc - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Collaboration And License Arrangement [Line Items] |  |  |  |  |
Collaboration revenue | $ 119 | $ 365 | $ 345 | $ 784 |
Contract asset |  |  |  |  | $ 4,913
Cash received up on conditions satisfied | 5,000 |  |  |  |
Deferred revenue | 15 |  | 15 |  |
Other Liabilities [Member] |  |  |  |  |
Collaboration And License Arrangement [Line Items] |  |  |  |  |
Cash received for milestone payment | 25,000 |  | 25,000 |  | $ 25,000
Current Liabilities [Member] | Maximum [Member] |  |  |  |  |
Collaboration And License Arrangement [Line Items] |  |  |  |  |
Deferred revenue | 100 |  | 100 |  |
Genentech [Member] |  |  |  |  |
Collaboration And License Arrangement [Line Items] |  |  |  |  |
Collaboration revenue | $ 100 | $ 300 | $ 300 | $ 500 |
Genentech [Member] | Genentech Agreement [Member] |  |  |  |  |
Collaboration And License Arrangement [Line Items] |  |  |  |  |
Collaborative arrangement, purpose |  |  | In December 2020, the Company and Genentech, Inc. (“Genentech”) entered into the Collaboration and License Agreement (“Genentech Agreement”). |  |
Collaborative arrangement, rights and obligations |  |  | During the three and six months ended June 30, 2023 and 2022, there were no material changes to the Genentech Agreement. Accordingly, there were no changes to the Company’s accounting treatment thereon through June 30, 2023. |  |

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