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Summary of Significant Accounting Policies (Intangible Assets Useful Life Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017
Minimum |
Useful life of patents | 1 year
Maximum |
Useful life of patents | 17 years

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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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