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Convertible Senior Notes (Carrying Amounts of Liability and Equity Components - Additional Information) (Details) - Convertible Senior Notes [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Aug. 31, 2018 | Aug. 24, 2018 | Jun. 30, 2014
2028 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 2.00% | 2.00% | 2.00% | 2.00% |
Transaction costs related to the equity component | $ 6,163 |  |  |  |
Remaining period over which the unamortized debt discount will be amortized | 9 years 2 months 12 days |  |  |  |
2019 Convertible Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 2.25% |  |  |  | 2.25%
Transaction costs related to the equity component | $ 236 | $ 236 |  |  |

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- Definition Transaction Costs Allocated Between Liability And Equity Components + References No definition available. + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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