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Cash Equivalents and Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 100,763 | $ 104,870
Corporate Securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 69,897 | 71,095
Municipal Debt Securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 15,897 | 18,707
Federal Home Loan Securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 4,967 | 8,017
Certificates of Deposit [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | 4,717 | 5,991
U.S. Treasury securities [Member] |  |
Available-for-sale [Line Items] |  |
Available-for-sale Securities | $ 5,285 | $ 1,060

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