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Available-for-Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 90,648 | $ 44,514
Less than 12 Months, Unrealized Loss | (314) | (97)
12 Months or Longer, Fair Value | 4,990 |
12 Months or Longer, Unrealized Loss | (12) |
Total, Fair Value | 95,638 | 44,514
Total, Unrealized Loss | (326) | (97)
United States government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 17,908 | 8,729
Less than 12 Months, Unrealized Loss | (35) | (24)
12 Months or Longer, Fair Value | 2,994 |
12 Months or Longer, Unrealized Loss | (6) |
Total, Fair Value | 20,902 | 8,729
Total, Unrealized Loss | (41) | (24)
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 72,740 | 35,785
Less than 12 Months, Unrealized Loss | (279) | (73)
12 Months or Longer, Fair Value | 1,996 |
12 Months or Longer, Unrealized Loss | (6) |
Total, Fair Value | 74,736 | 35,785
Total, Unrealized Loss | $ (285) | $ (73)

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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. + 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=82897076&loc=d3e27337-111563 + 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. + 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=82897076&loc=d3e27337-111563 + Details
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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 less than 12 months. + 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=82897076&loc=d3e27337-111563 + Details
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