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Cash Equivalents and Investments - Schedule of Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale [Line Items]
Available-for-sale Securities	$ 85,041	$ 74,510
Corporate Securities [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	46,883	32,962
Municipal Debt Securities [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	23,327	29,066
Federal Home Loan Securities [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	8,052	8,013
Certificates of Deposit [Member]
Available-for-sale [Line Items]
Available-for-sale Securities	$ 6,779	$ 4,469

X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

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.

+ Details

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X

- Details

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X

- Details

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