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Deferred revenue (Tables)
12 Months Ended
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]  
Explanation of significant changes in contract liabilities
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