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3. Accounts receivable (Tables)
9 Months Ended
Sep. 30, 2015
Receivables [Abstract]  
Accounts Receivable
   September 30, 2015 

 

December 31, 2014

           
Customer receivables  $28,130   $41,234 
Less:  Allowance for uncollectible accounts   (12,880)   (13,897)
   $15,250   $27,337