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Accounts receivable
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Accounts receivable
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


Accounts receivable – holdbacks represent amounts up to 10% of the contract value under certain contracts that the customer is contractually entitled to withhold until completion of the project or until certain project milestones are achieved.