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Net Sales and Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Revenues [Abstract]      
Net Reporting Amount $ 10.4 $ 11.6  
Deferred Revenue 1.3   $ 1.3
Deferred Revenue Revenue Recognized $ 1.3    
Top Five Customers Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage     17.00%
Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage     8.00%