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Intangible Assets, Net (Other Than Goodwill) (Details 2) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Remainder of 2019 $ 423,939 $ 564,987    
2020 562,554 562,554    
2021 562,554 562,554    
2022 469,220 469,220    
2023 418,232 418,232    
Thereafter 733,235 732,637    
Carrying Value $ 3,169,734 $ 3,310,184 $ 2,878,080 $ 3,474,291