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Short-Term and Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) $ in Thousands	Sep. 30, 2021 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 50,216
Available For Sale Debt Securities Estimated Fair Value	50,217
Failed Auction Security [Member]
Schedule of Available-for-sale Securities [Line Items]
Due in twenty to forty years, Cost	3,000
Due in twenty to forty years, Estimated Fair Value	2,598
US Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Maturities greater than three months but less than one year, Cost	50,216
Maturities greater than three months but less than one year, Estimated Fair Value	$ 50,217

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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+ References

No definition available.

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- Definition

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+ References

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- Definition

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- Definition

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