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Cash Equivalents and Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 103,541 | $ 93,239
Corporate securities |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 58,830 | 61,385
Municipal Debt Securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 13,419 | 14,377
U.S. Treasury securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 21,888 | 10,205
Certificates of Deposit [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 3,906 | 3,710
Federal Home Loan Securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 5,498 | $ 3,562

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