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2. Accounts receivable, net (Tables)
9 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Accounts Receivable
   September 30,
2018
  

December 31,
2017

 
         
Customer receivables  $37,788   $35,821 
Less:  Allowance for uncollectible accounts   (35,821)   (35,821)
   $1,967   $