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Cash and Investments in Marketable Securities - Cash and Investments in Marketable Securities, Including Cash Equivalents (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Cash and cash equivalents | $ 96,363 | $ 194,905
Short-term investments | 1,228,499 | 1,140,445
Long-term investments | 279,119 | 582,889
Total cash and investments in marketable securities | $ 1,603,981 | $ 1,918,239

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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), classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562 + Details
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