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Cash Equivalents and Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 93,386 | $ 99,715
Corporate securities |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 63,110 | 72,964
Municipal Debt Securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 15,693 | 13,215
Federal Home Loan Securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 3,685 | 3,927
Certificates of Deposit [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 3,991 | 4,404
U.S. Treasury securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 6,907 | $ 5,205

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