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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Apr. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and investments in marketable securities |  |  | $ 372,658,000 |  | $ 372,658,000 |  | $ 504,977,000
Accounts receivable, credit loss expense (reversal) |  |  | $ 0 | $ 0 | $ 0 | $ 0 |
Employee Severance | 2022 Restructuring Plan |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Workforce termination, percentage |  | 70.00% |  |  |  |  |
Employee Severance | 2023 Restructuring Plan |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Workforce termination, percentage | 60.00% |  |  |  |  |  |

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