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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Accounts receivable
   

March 31,

2018

   

December 31,

2017

 
Accounts receivable    $ 27,793     $ 26,762  
Less: Allowance for doubtful accounts             
Total    $ 27,793     $ 26,762