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2. Accounts receivable (Tables)
6 Months Ended
Jun. 30, 2016
Receivables [Abstract]  
Accounts receivable

 

   June 30, 2016 

 

December 31, 2015

           
Customer receivables  $36,726   $21,431 
Less:  Allowance for uncollectible accounts   (15,929)   (12,880)
   $20,797   $8,551