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Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of intangible assets
   June 30,   December 31, 
   2018   2017 
Gross carrying amount  $5,100,225   $5,188,547 
Accumulated amortization   (4,772,466)   (4,789,691)
Net carrying amount  $327,759   $398,856