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Accounts receivable (Tables)
12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule of accounts receivable
 
 
December 31, 2016

 
December 31, 2015

Accounts receivable – trade
 
$
38,746

 
$
24,028

Accounts receivable – holdbacks
 
528

 

Accounts receivable – other
 
806

 
708

 
 
$
40,080

 
$
24,736