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Product Warranties (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Product Warranty Liability [Line Items]    
Warranty liability, beginning of year $ 213,000 $ 0
Accruals 69,000 283,000
Payments (114,000) (70,000)
Adjustments and other 13,000
Warranty liability, end of year $ 181,000 $ 213,000