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Net Sales and Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenues [Abstract]          
Net Reporting Amount $ 10.4 $ 12.5 $ 20.8 $ 24.1  
Deferred Revenue $ 1.3   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%
Top Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Concentration Risk, Percentage         8.00%