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Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Apr. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cash | $ 94,413 | $ 104,655 |  |
Money market instruments | 10,883 | 3,557 |  |
Cash and cash equivalents | 105,296 | 108,212 | $ 109,572 | $ 106,582
Current investments | 441,337 | 427,348 |  |
Non-current investments | 317,054 | 262,039 |  |
Total | 863,687 | 797,599 |  |
Treasury bills |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Current investments | 189,808 | 198,477 |  |
Long-term investments | 105,298 | 32,760 |  |
Asset-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Current investments | 98,910 | 78,407 |  |
Long-term investments | 41,460 | 53,631 |  |
Corporate bonds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Current investments | 137,228 | 137,871 |  |
Long-term investments | 152,645 | 162,566 |  |
Agency bonds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Long-term investments | 5,913 | 5,921 |  |
Sovereign bonds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Current investments | 10,900 | 8,101 |  |
Long-term investments | 10,891 | 6,316 |  |
Municipal bonds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Current investments | 4,491 | 4,492 |  |
Long-term investments | $ 847 | $ 845 |  |

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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (available-for-sale), classified as noncurrent. + 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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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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