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Concentration of Credit Risk (Detail Textuals) - Customer concentration risk - Customer
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenue          
Concentration Risk [Line Items]          
Number of customers 2 1 2 1  
Revenue | Customer one          
Concentration Risk [Line Items]          
Concentration risk percentage 50.30% 56.10% 53.90% 56.70%  
Revenue | Customer two          
Concentration Risk [Line Items]          
Concentration risk percentage 22.50%   17.70%    
Accounts receivable          
Concentration Risk [Line Items]          
Number of customers     2   2
Accounts receivable | Customer one          
Concentration Risk [Line Items]          
Concentration risk percentage     45.10%   56.60%
Accounts receivable | Customer two          
Concentration Risk [Line Items]          
Concentration risk percentage     37.70%   23.90%