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Segment Reporting and Significant Customer Information - Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2015
customer
segment
Dec. 31, 2014
customer
Segments (Textual) [Abstract]    
Number of reportable operating segments 2  
Accounts Receivable | Credit Concentration Risk    
Concentration Risk [Line Items]    
Number of customers | customer 1 1
Concentration risk percentage 15.00% 11.00%