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Summary of Significant Accounting Policies and Practices (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 mo yr
Summary Of Significant Accounting Policies And Practices 1 | yr | 50
Summary Of Significant Accounting Policies And Practices 2 | 17.00%
Summary Of Significant Accounting Policies And Practices 3 | 50.00%
Summary Of Significant Accounting Policies And Practices 4 | mo | 12

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