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Stock Plans - ESPP (Details) - ESPP shares in Millions	12 Months Ended
	Dec. 31, 2016 shares
Share-based compensation
Number of shares authorized	1.5
Share price (as a percent)	85.00%
Offer period	6 months

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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.

+ References

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Purchase price of common stock expressed as a percentage of its fair value.

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- Definition

Duration of offer period under the plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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