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Investments - Debt Securities and Other Investments, Included on Condensed Consolidated Balance Sheets and Recorded at Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 45,891 | $ 44,666
Gross Unrealized Gains | 296 | 457
Gross Unrealized Losses | (40) | (7)
Fair Value | 46,147 | 45,116
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 14,176 | 11,762
Gross Unrealized Gains | 68 | 123
Gross Unrealized Losses | (13) |
Fair Value | 14,231 | 11,885
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,600 | 2,854
Gross Unrealized Gains | 25 | 30
Fair Value | 2,625 | 2,884
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,772 | 6,634
Gross Unrealized Gains | 42 | 74
Gross Unrealized Losses | (2) |
Fair Value | 5,812 | 6,708
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,775 | 11,536
Gross Unrealized Gains | 92 | 114
Gross Unrealized Losses | (22) | (6)
Fair Value | 11,845 | 11,644
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,704 | 9,763
Gross Unrealized Gains | 66 | 112
Gross Unrealized Losses | (1) |
Fair Value | 9,769 | 9,875
Foreign Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,331 | 1,334
Gross Unrealized Gains | 3 | 4
Gross Unrealized Losses | (2) | (1)
Fair Value | 1,332 | 1,337
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 250
Fair Value |  | 250
Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 533 | 533
Fair Value | $ 533 | $ 533

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- Definition Amount, before tax, of unrealized gain 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 (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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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=121645371&loc=d3e27161-111563 + Details
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- 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=121645371&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=121558606&loc=SL82898722-210454 + Details
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