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Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Product Warranty Liability [Line Items]    
Beginning balance $ 858 $ 1,223
Warranty provisions 103 38
Warranty claims (25) (111)
Adjustments to preexisting warranties (231) (167)
Currency (7) 4
Ending balance $ 698 $ 987
Minimum [Member]    
Product Warranty Liability [Line Items]    
Product Warranty Period 2 years  
Maximum [Member]    
Product Warranty Liability [Line Items]    
Product Warranty Period 5 years