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Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 9,577 | $ 75,761
Less than 12 Months, Unrealized Loss | (7) | (253)
12 Months or Longer, Fair Value | 25,499 | 10,975
12 Months or Longer, Unrealized Loss | (10) | (30)
Total, Fair Value | 35,076 | 86,736
Total, Unrealized Loss | (17) | (283)
United States government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 5,527 | 14,948
Less than 12 Months, Unrealized Loss | (2) | (22)
12 Months or Longer, Fair Value | 3,496 | 999
12 Months or Longer, Unrealized Loss | (1) | (1)
Total, Fair Value | 9,023 | 15,947
Total, Unrealized Loss | (3) | (23)
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 4,050 | 60,813
Less than 12 Months, Unrealized Loss | (5) | (231)
12 Months or Longer, Fair Value | 22,003 | 9,976
12 Months or Longer, Unrealized Loss | (9) | (29)
Total, Fair Value | 26,053 | 70,789
Total, Unrealized Loss | $ (14) | $ (260)

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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 http://asc.fasb.org/extlink&oid=118955579&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 http://asc.fasb.org/extlink&oid=118939692&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 http://asc.fasb.org/extlink&oid=118942371&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 http://asc.fasb.org/extlink&oid=118939692&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 http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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