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Product Warranty (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Product warranty provision [Abstract]  
Warranty terms for SDB contracts 1 year
Accrued warranty, current $ 843
Accrued warranty, noncurrent 204
Activities in product warranty account [Abstract]  
Balance at January 1, 2020 1,323
Current period provision (136)
Current period claims (149)
Currency adjustment 9
Balance at September 30, 2020 $ 1,047