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Stockholders' equity - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]        
Balance as of December 31, 2020     $ (6,625)  
Other comprehensive income before reclassifications $ (1,521) $ 2,442 596 $ (889)
Balance as of September 30, 2021 (6,029)   (6,029)  
Foreign Currency Translation        
Increase (Decrease) Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]        
Balance as of December 31, 2020     (6,625)  
Net other comprehensive income     596  
Balance as of September 30, 2021 $ (6,029)   $ (6,029)