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Short-Term and Long-Term Investments - Additional Information (Detail) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Unrealized Losses On Short Term And Long Term Investments [Line Items] |  |  |  |
Short Term Investments | $ 50,217,000 | $ 50,166,000 |  |
Minimum period for which failed auction securities been in unrealized loss position | 12 months |  |  |
Failed Auction Security [Member] |  |  |  |
Unrealized Losses On Short Term And Long Term Investments [Line Items] |  |  |  |
Amortized cost of securities | $ 3,000,000 | 3,000,000 |  |
Period for which failed auction securities been in unrealized loss position | exceeds 12 months |  |  |
Estimated Fair Value | $ 2,598,000 | 2,517,000 |  |
Gross Unrealized Losses | 402,000 | 483,000 |  |
Aggregate credit loss | 30,000 | $ 33,000 | $ 34,000 | $ 37,000
Aggregate temporary impairment loss | $ 372,000 |  |  |

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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