Convertible Senior Notes and Capped Calls - Carrying Amount of Liability Component (Details) - Convertible Debt [Member] - The Notes [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Aug. 31, 2018
Debt Instrument [Line Items]
Principal	$ 230,000	$ 230,000
Unamortized debt discount	(45,690)	(50,334)
Unamortized issuance costs	(4,519)	(4,978)	$ (6,900)
Net carrying amount	$ 179,791	$ 174,688

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 470
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-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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