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Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

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No definition available.

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