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Summary of Significant Accounting Policies - Revenue Recognition (Details Textual)
12 Months Ended
Dec. 31, 2015
Minimum [Member]  
Significant Accounting Policies [Line Items]  
Revenue recognition requisite period (in days) 3 days
Maximum [Member]  
Significant Accounting Policies [Line Items]  
Revenue recognition requisite period (in days) 30 days