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3. Accounts receivable (Tables)
6 Months Ended
Jun. 30, 2015
Accounting Policies [Abstract]  
Accounts Receivable
   June 30, 2015

December 31, 2014

Customer receivables  $22,475   $41,234 
Less:  Allowance for uncollectible accounts   (12,880)   (13,897)
   $9,595   $27,337