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Revenue Recognition Contract with Customer, Asset and Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract]      
Contract with Customer, Liability, Revenue Recognized $ (46) $ 22  
Contract with Customer, Asset, Net, Current 65 65 $ 52
Contract with Customer, Asset, Net, Noncurrent 999 999 465
Contract with Customer, Asset, Net 1,064 1,064 517
Contract with Customer, Liability, Discounts (1,656) (1,656) (1,133)
Contract with Customer, Right to Recover Product (325) (325) (462)
Contract with Customer, Liability, Current $ (1,981) $ (1,981) $ (1,595)