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Product Warranty (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Product warranty provision [Abstract]  
Warranty terms for SDB contracts 1 year
Accrued warranty, current $ 949
Accrued warranty, noncurrent 344
Activities in product warranty account [Abstract]  
Balance, January 1, 2019 1,323
Current period provision 47
Current period claims (73)
Currency adjustment (4)
Balance at September 30, 2019 $ 1,293