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6. Accounts receivable, net (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts receivable $ 4,082 $ 3,089
Current
   
Accounts receivable 2,113 1,698
30 - 59 days past due
   
Accounts receivable 598 440
60 - 89 days past due
   
Accounts receivable 59 302
Greater than 90 days past due
   
Accounts receivable $ 1,312 $ 649