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Product Warranty (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
Product warranty provision [Abstract]  
Warranty terms for long-term contracts 1 year
Accrued warranty, current $ 1,232
Accrued warranty, noncurrent 425
Activities in product warranty account [Abstract]  
Balance, January 1, 2017 1,478
Warranty provision 296
Warranty claims (124)
Currency adjustment 7
Balance, March 31, 2017 $ 1,657