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Trade and other receivables (Tables)
 12 Months Ended
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of trade and other receivables
December 31, 2021December 31, 2020
Trade accounts receivable$19,423 $29,252 
Other receivables6,586 5,269 
Contract assets20,386 22,274 
$46,395 $56,795 
Explanation of significant changes in contract assets
Contract assetsDecember 31, 2021
At January 1, 2021$22,274 
Additions to contract assets27,282 
Invoiced during the year(29,170)
At December 31, 2021$20,386 
Deferred revenueDecember 31, 2021December 31, 2020
Beginning Balance$9,888 $20,156 
Additions to deferred revenue23,618 43,166 
Revenue recognized during the year(21,397)(53,434)
Ending Balance$12,109 $9,888