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Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Product Warranty Disclosure [Abstract]    
Warranty, Beginning Balance $ 391 $ 246
Warranty (payments) or credits (79) (37)
Warranty additions 6 182
Warranty, Ending Balance $ 318 $ 391