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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Presentation of leases for lessee [abstract]  
Right-of-use assets
The following table summarizes our right-of-use assets outstanding at December 31:
20212020
As at beginning of year$372,468 $430,713 
Additions208,976 297,373 
Lease modification323,782 — 
Depreciation expense(321,822)(357,230)
Foreign exchange impact847 1,612 
As at end of year$584,251 $372,468 
Lease liabilities
The following table summarizes our lease liabilities outstanding at December 31:
20212020
As at beginning of year$402,059 $506,275 
Additions203,868 297,373 
Lease modification323,782 — 
Payment of lease liabilities(365,510)(460,724)
Interest expense on lease liabilities91,727 68,526 
Foreign exchange impact(1,173)(9,391)
As at end of year$654,753 $402,059 
Total undiscounted lease liability
Our total undiscounted lease liability as at December 31, 2021 is as follows:
December 31, 2021
Less than one year$372,707 
One to five years434,936 
More than five years— 
Total undiscounted lease liability $807,643