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Share Based Award ESPP Narrative (Details) | Dec. 31, 2017 shares
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
ESPP Original Issuance | 750,000
ESPP Annual Issuance Increase Limit | 300,000
Shares available in employee stock purchase plan | 133,487

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- Definition ESPP Annual Issuance Increase Limit + References No definition available. + Details
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Period Type: | instant

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- Definition ESPP Original Issuance + References No definition available. + Details
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Period Type: | instant

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- Definition Shares available in employee stock purchase plan + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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