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Inventory Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]      
Inventory $ 20,855,000 $ 8,875,000  
Cost of goods sold      
Inventory [Line Items]      
Inventory Write-down $ 300,000 $ 0 $ 300,000