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Segment Information and Concentration of Business Risk, Revenue from Significant Partners (Details) - Partner
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue [Member] | Customer Concentration [Member] | Partner A [Member]      
Significant Partners [Abstract]      
Concentration percentage 51.00% 60.00% 37.00%
Revenue [Member] | Customer Concentration [Member] | Partner B [Member]      
Significant Partners [Abstract]      
Concentration percentage 14.00% 2.00% 33.00%
Revenue [Member] | Customer Concentration [Member] | Partner C [Member]      
Significant Partners [Abstract]      
Concentration percentage 10.00% 2.00% 11.00%
Revenue [Member] | Customer Concentration [Member] | Partner D [Member]      
Significant Partners [Abstract]      
Concentration percentage 11.00% 0.00% 0.00%
Revenue [Member] | Customer Concentration [Member] | Partner E [Member]      
Significant Partners [Abstract]      
Concentration percentage 3.00% 19.00% 2.00%
Revenue [Member] | Customer Concentration [Member] | Partner F [Member]      
Significant Partners [Abstract]      
Concentration percentage 2.00% 4.00% 12.00%
Contracts Receivables [Member] | Credit Concentration [Member] | Significant Partners [Member]      
Significant Partners [Abstract]      
Concentration percentage 84.00% 92.00%  
Number of significant partners 2 2