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Segment Information (Accounts Receivable by Major Customer) (Details) - Accounts Receivable
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Account X    
Segment Reporting Information    
Percentage of accounts receivable 80.00% 54.00%
Account Y    
Segment Reporting Information    
Percentage of accounts receivable 11.00% 5.00%