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Stockholders' Equity - Registration Rights Agreement (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2016
Debt Instrument [Line Items]
Maximum amount of repurchase rights agreement	$ 50
Effectiveness penalty percentage	0.25%
Purchase price allocation percentage	0.75%
5% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	5.00%		5.00%
5% Convertible Senior Notes due 2021 | Convertible Debt
Debt Instrument [Line Items]
Interest rate on the 90th day following registration statement	0.25%
Interest rate on the 91st day following the registration statement	0.50%
Registration statement liquidation damages limit	0.50%
Debt instrument, interest rate	5.00%	0.50%
2.5% Convertible Senior Note [Member] | Convertible Debt
Debt Instrument [Line Items]
Registration statement liquidation damages limit	5.00%
Debt instrument, interest rate	2.50%
Liquidation damages percent	1.00%

X

- Definition

Interest Rate on the 90th Day Following Registration Statement

+ References

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- Definition

Interest Rate on the 91st Day Following the Registration Statement

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- Definition

Liquidation Damages Percent

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- Definition

This element represents the maximum amount of repurchase rights agreement.

+ References

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- Definition

Registration Statement Effectiveness Penalty Percentage

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- Definition

Registration Statement Effectiveness Purchase Price Allocation Percentage

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- Definition

Registration Statement Liquidation Damages Limit

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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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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