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Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Product Warranty Disclosure [Abstract]    
Warranty, Beginning Balance $ 391 $ 246
Warranty (payments) credits (4) (37)
Provision, increase (decrease) (107) 182
Warranty, Ending Balance $ 280 $ 391