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Concentration (Details) - Revenue [Member]
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Concentration of revenue from customers    
Concentration risk percentage 10.00% 10.00%
Customer A [Member]    
Concentration of revenue from customers    
Concentration risk percentage 18.00% [1]
Customer B [Member]    
Concentration of revenue from customers    
Concentration risk percentage 16.00% [1]
Customer C [Member]    
Concentration of revenue from customers    
Concentration risk percentage [1] 12.00%
Customer D [Member]    
Concentration of revenue from customers    
Concentration risk percentage 12.00% [1]
Customer E [Member]    
Concentration of revenue from customers    
Concentration risk percentage 11.00% [1]
[1] Less than 10%.