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Property, Plant and Equipment - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Inventory write-down $ 536,000 $ 0 $ 0
Depreciation and other amortization 132,189 $ 174,275 $ 247,357
Leasehold Improvements and Furnitures and Fixtures      
Property, Plant and Equipment [Line Items]      
Inventory write-down $ 129,000