Convertible Notes - Summary of Convertible Notes (Details) - Convertible Senior Notes - USD ($) $ in Thousands	Sep. 30, 2019	Aug. 31, 2019
Debt Instrument [Line Items]
Principal	$ 1,265,000	$ 1,265,000
Unamortized debt discount and issuance costs	(384,609)
Net carrying amount	880,391
Carrying amount of the equity component	$ 377,432	$ 381,500

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Face (par) amount of debt instrument at time of issuance.

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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 of unamortized debt discount (premium) and debt issuance 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.

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