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Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Avaliable-For-Sale Securities [Line Items] |  |
Available-for-sale Securities | $ 104,870 | $ 74,510
Corporate Securities [Member] |  |
Schedule of Avaliable-For-Sale Securities [Line Items] |  |
Available-for-sale Securities | 71,095 | 32,962
Municipal Debt Securities [Member] |  |
Schedule of Avaliable-For-Sale Securities [Line Items] |  |
Available-for-sale Securities | 18,707 | 29,066
Federal Home Loan Securities [Member] |  |
Schedule of Avaliable-For-Sale Securities [Line Items] |  |
Available-for-sale Securities | 8,017 | 8,013
Certificates of Deposit [Member] |  |
Schedule of Avaliable-For-Sale Securities [Line Items] |  |
Available-for-sale Securities | 5,991 | 4,469
US Treasury Securities [Member] |  |
Schedule of Avaliable-For-Sale Securities [Line Items] |  |
Available-for-sale Securities | $ 1,060 | $ 0

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