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Stock Plans - Restricted Stock Units - Vesting (Details) - Restricted Stock Units (RSUs) | 12 Months Ended
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Dec. 31, 2018
Employee | Minimum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period from the date of grant for restricted stock awards granted | 1 year
Employee | Maximum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period from the date of grant for restricted stock awards granted | 4 years
Non-Employee Director |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period from the date of grant for restricted stock awards granted | 1 year

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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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- Details
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- Details
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- Details
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- Details
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- Details
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