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Business and Summary of Significant Accounting Policies - Perpetual License and Maintenance Revenue (Details) - Perpetual license and maintenance revenue | 9 Months Ended
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Sep. 30, 2018
Disaggregation of Revenue [Line Items] |
License and maintenance period | 1 year
Estimated maintenance renewal period | 4 years
Economic life of perpetual license contracts | 5 years

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- Definition License And Maintenance Period + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Maintenance Renewal Period + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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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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Balance Type: | na
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |