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Concentration of Customer Risk (Tables)
3 Months Ended
Mar. 31, 2018
Concentration Of Customer Risk Tables  
Significant customer risk percentage
    2018     2017  
    $     %     $     %  
Customer A     45,297       66.5       4,415       66.0  
Customer B     2,786       25.0       n/a       n/a  
Customer C     n/a       n/a       298       10.6