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2. Accounts receivable (Tables)
9 Months Ended
Sep. 30, 2016
Receivables [Abstract]  
Accounts receivable
    September 30, 2016  

 

December 31, 2015

                 
Customer receivables   $ 15,664     $ 21,431  
Less:  Allowance for uncollectible accounts     (14,401 )     (12,880 )
    $ 1,263     $ 8,551