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Equity Incentive Plans and Stock-Based Compensation (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 24, 2014 shares | Apr. 30, 2009 shares | Sep. 30, 2017 | Jun. 30, 2012 shares | Dec. 31, 2017 numerator denominator shares | Dec. 31, 2015 shares | Apr. 23, 2015 shares | Mar. 31, 2006 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Tenure of award (in years) |  |  |  |  | 10 years |  |  |
Numerator in conversion factor used to determine shares available for grant | numerator |  |  |  |  | 1.5 |  |  |
Denominator in conversion factor used to determine shares available for grant | denominator |  |  |  |  | 1 |  |  |
Option One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Requisite service period (in months) |  |  |  |  | 60 months |  |  |
Option Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Requisite service period (in months) |  |  |  |  | 48 months |  |  |
Stock Compensation Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares reserved for issuance under the stock option plan |  |  |  |  | 35,400,000 |  | 4,000,000 | 8,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 10,000,000 | 6,500,000 |  | 6,500,000 |  | 4,000,000 |  |
Restricted Stock and Stock Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Requisite service period (in months) |  |  | 2 years 4 months 24 days |  | 4 years |  |  |
Director [Member] | Restricted Stock and Stock Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Requisite service period (in months) |  |  |  |  | 1 year |  |  |

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- Definition Represents the denominator in the conversion factor used to determine the change in remaining shares available for grant. + References No definition available. + Details
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- Definition Represents the numerator in the conversion factor used to determine the change in remaining shares available for grant. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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 Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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