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Contingent Liabilities and Commitments (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2019
Dec. 31, 2018
Contingent Liabilities and Commitments (Textual)          
Termination fee       $ 100,000  
Purchase of inventory       474,000  
Other obligations       144,000  
Milestone payment $ 150,000        
Royalty, percentage   4.00%      
Growth assumption, percentage     6.00%    
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 (and thereafter)         25,000
Royalties       $ 3,750 $ 10,396