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Warranties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Product Warranty Disclosure [Abstract]    
Warranty, Beginning Balance $ 246 $ 193
Warranty (payments) or credits (37) (7)
Warranty additions 182 60
Warranty, Ending Balance $ 391 $ 246