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Venezuelan operations - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 20, 2018
/ $
Aug. 19, 2018
/ $
Foreign Operations Disclosure [Line Items]          
Revenue from Venezuelan operations $ 4,494 $ 10,184 $ 78,859    
Operating income (loss) from Venezuelan operations (7,712) $ (8,240) $ (52,054)    
NEW DICOM | Venezuela          
Foreign Operations Disclosure [Line Items]          
Foreign currency exchange rate (VES per USD) | / $       59.93 2.48
Non-monetary asset $ 10,100