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Cash Equivalents and Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale [Line Items]
Available-for-sale Securities	$ 98,510	$ 104,870
Corporate Securities [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	72,532	71,095
Municipal Debt Securities [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	12,307	18,707
Federal Home Loan Securities [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	3,968	8,017
Certificates of Deposit [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	4,436	5,991
U.S. Treasury securities [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	$ 5,267	$ 1,060

X

- Definition

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

+ References

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+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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