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Net Loss Per Share - Narrative (Details) - $ / shares shares in Millions	1 Months Ended
	May 31, 2018	Jun. 30, 2018
Debt Conversion [Line Items]
Conversion price on convertible debt (in USD per share)		$ 40.82
Convertible Senior Notes | Convertible debt
Debt Conversion [Line Items]
Conversion price on convertible debt (in USD per share)	$ 40.82
Number of shares covered in the Capped Call Transactions		6.3
Cap price of the Capped Call Transactions (in dollars per share)	$ 62.80
Number of shares expected to be issued at conversion price under Capped Call Transactions		4.1

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Debt Instrument, Capped Call Transactions, Shares Coverage

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- Definition

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- Definition

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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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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

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