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Comprehensive loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance $ 29,812 $ 30,622
Balance 26,309 29,812
Accumulated Other Comprehensive Loss [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (15) 846
Other comprehensive income (loss) before reclassifications, net of taxes 612 (1,474)
Total other comprehensive income (loss) before reclassifications, net of taxes 597 (628)
Net amount reclassified to earnings (1,517) 613
Balance (920) (15)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance 1,451 1,191
Total other comprehensive income (loss) before reclassifications, net of taxes 1,451 1,191
Net amount reclassified to earnings (1,504) 260
Balance (53) 1,451
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance   342
Other comprehensive income (loss) before reclassifications, net of taxes 46 (695)
Total other comprehensive income (loss) before reclassifications, net of taxes 46 (353)
Net amount reclassified to earnings (13) 353
Balance 33  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance (1,466) (687)
Other comprehensive income (loss) before reclassifications, net of taxes 566 (779)
Total other comprehensive income (loss) before reclassifications, net of taxes (900) (1,466)
Balance $ (900) $ (1,466)