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Comprehensive loss - Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Comprehensive loss    
Balance at the beginning $ 29,927 $ 29,640
Balance at the end 18,773 29,927
Accumulated Other Comprehensive Loss    
Comprehensive loss    
Balance at the beginning (2,192) (938)
Other comprehensive income (loss) before reclassifications, net of taxes (1,233) (1,402)
Total other comprehensive loss before reclassifications, net of taxes (3,425) (2,340)
Net amount reclassified to earnings 1,317 148
Balance at the end (2,108) (2,192)
Pension Liability Adjustment    
Comprehensive loss    
Balance at the beginning (858) (444)
Other comprehensive income (loss) before reclassifications, net of taxes 561 (457)
Total other comprehensive loss before reclassifications, net of taxes (297) (901)
Net amount reclassified to earnings 211 43
Balance at the end (86) (858)
Fair Value of Derivatives    
Comprehensive loss    
Balance at the beginning (353)  
Other comprehensive income (loss) before reclassifications, net of taxes (1,118) (458)
Total other comprehensive loss before reclassifications, net of taxes (1,471) (458)
Net amount reclassified to earnings 1,106 105
Balance at the end (365) (353)
Foreign Currency Translation Adjustment    
Comprehensive loss    
Balance at the beginning (981) (494)
Other comprehensive income (loss) before reclassifications, net of taxes (676) (487)
Total other comprehensive loss before reclassifications, net of taxes (1,657) (981)
Balance at the end $ (1,657) $ (981)