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Contingent Liabilities and Commitments (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Contingent Liabilities and Commitments (Textual)        
Termination fee $ 100,000      
Purchase of inventory 682,000      
Other obligations 142,000      
Milestone payment   $ 150,000    
Royalty, percentage     4.00%  
Growth assumption, percentage       6.00%
Royalty payment to Baylor 7,500 $ 5,000    
Royalties due for 2017 5,000      
Royalties due for 2018 10,000      
Royalties due for 2019 15,000      
Royalties due for 2020 20,000      
Royalties due for 2021 25,000      
Capital expenditures $ 77,000