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Fair Value Measurement - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jul. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 513,454,000 | $ 513,454,000 |  | $ 193,822,000
Loss on extinguishment of debt | (5,650,000) | (5,650,000) |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents | $ 414,700,000 | $ 414,700,000 |  | $ 126,600,000
0.375% Convertible Senior Notes due 2024 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Principal amount |  |  | $ 287,500,000 |
Notes, due date |  | Jul. 15, 2024 |  |
Notes, frequency of periodic payment |  | semi-annually |  |
Total convertible senior notes |  |  | 230,200,000 |
Fair value of convertible senior notes |  |  | $ 287,900,000 |
Senior convertible notes | 0.375% | 0.375% | 0.375% |

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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=118932676&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=118951113&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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