Discount cost incurred related to the issuance of the debt.

No definition available.

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- Definition

Other cost incurred related to the issuance of the debt.

+ References

No definition available.

+ Details

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- Definition

Amount of cash outflow arising from the purchase of capped call and common stock forward.

+ References

No definition available.

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- References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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-Section 55
-Paragraph 8
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Period Type:	instant

- 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
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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Convertible Senior Notes - Net proceeds (Details) - USD ($) $ in Thousands		6 Months Ended
	Mar. 08, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018
Convertible Senior Notes
Less cost of related capped call and common stock forward			$ (43,500)
Proceeds from issuance of debt			$ 95,856
Convertible Senior Notes
Convertible Senior Notes
Interest rate (as a percent)				5.50%
Convertible Senior Notes
Principal amount	$ 100,000	$ 100,000		$ 100,000
Less initial purchasers' discount	(3,250)
Less cost of related capped call and common stock forward	(43,500)
Less other issuance costs	(894)	$ (1,700)
Proceeds from issuance of debt	$ 52,356