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Significant Accounting Policies (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
ft²
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 1    
Net revenues from customers outside the United States $ 1,600,000 $ 2,000,000 $ 900,000
Distribution costs 621,142 703,353 839,450
Advertising costs $ 2,589,185 $ 2,626,238 $ 2,576,070
Corporate Headquarters      
Operating Leased Assets [Line Items]      
Area of Real Estate Property | ft² 25,500    
CET Life Sciences Center      
Operating Leased Assets [Line Items]      
Area of Real Estate Property | ft² 14,200