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Accounts receivable and other (Tables)
 12 Months Ended
Dec. 31, 2019
Trade and other receivables [abstract]  
Summary of accounts receivable and other
 
December 31, 2019

 
December 31, 2018

 
 
 
 
Trade receivables
$
35,107

 
$
22,072

Value added tax and other taxes recoverable
17,658

 
34,791

Other receivables and advances
10,736

 
8,378

Prepaid expenses and deposits
11,789

 
15,746

 
$
75,290

 
$
80,987