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Deferred revenue
 12 Months Ended
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]  
Deferred revenue Deferred revenue:
Deferred revenue (i.e. contract liabilities) represents cash received from customers in excess of revenue recognized on uncompleted contracts.

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