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Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Product Warranty Liability [Line Items]    
Beginning balance $ 656 $ 858
Warranty provisions 78 80
Warranty claims (55) (18)
Adjustments to preexisting warranties (114) (222)
Currency (1) (5)
Ending balance $ 564 $ 693
Minimum [Member]    
Product Warranty Liability [Line Items]    
Product Warranty Period 2 years  
Maximum [Member]    
Product Warranty Liability [Line Items]    
Product Warranty Period 5 years