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Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 20,847 | $ 28,094
Less than 12 Months, Unrealized Loss | (383) | (876)
12 Months or Longer, Fair Value | 41,121 | 32,828
12 Months or Longer, Unrealized Loss | (1,942) | (1,961)
Total, Fair Value | 61,968 | 60,922
Total, Unrealized Loss | (2,325) | (2,837)
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 11,183 | 16,500
Less than 12 Months, Unrealized Loss | (233) | (544)
12 Months or Longer, Fair Value | 26,804 | 20,050
12 Months or Longer, Unrealized Loss | (1,210) | (1,159)
Total, Fair Value | 37,987 | 36,550
Total, Unrealized Loss | (1,443) | (1,703)
United States government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 8,107 | 9,869
Less than 12 Months, Unrealized Loss | (98) | (234)
12 Months or Longer, Fair Value | 12,732 | 11,362
12 Months or Longer, Unrealized Loss | (525) | (584)
Total, Fair Value | 20,839 | 21,231
Total, Unrealized Loss | (623) | (818)
Mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 1,557 | 1,725
Less than 12 Months, Unrealized Loss | (52) | (98)
12 Months or Longer, Fair Value | 1,585 | 1,416
12 Months or Longer, Unrealized Loss | (207) | (218)
Total, Fair Value | 3,142 | 3,141
Total, Unrealized Loss | $ (259) | $ (316)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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