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Pension Benefits - Benefit obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits    
Projected benefit obligation at beginning of the year $ 5,940 $ 4,611
Service cost 572 492
Interest cost 247 249
Actuarial gain (loss) 559 505
Foreign currency exchange rates changes (359) 168
Benefits paid (120) (85)
Projected benefit obligation at end of the year $ 6,839 $ 5,940