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Summary of Significant Accounting Policies - Basis of presentation (Details) | 12 Months Ended
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Dec. 31, 2018 segment
Summary of Significant Accounting Policies |
Percentage Of Capital Distribution | 100.00%
Number of reportable segments | 2

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- Definition Represents the percentage of capital distribution. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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