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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2018
Receivables [Abstract]  
Accounts Receivable
    June 30, 2018   December 31, 2017
         
Customer receivables   $ 39,470     $ 35,821  
Less:  Allowance for uncollectible accounts     (35,821 )     (35,821 )
    $ 3,649     $ —