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Accounts receivable
12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Accounts receivable

5. Accounts receivable

Accounts receivable consist of the following:

 

     As of December 31,  
     2014      2013  

Accounts receivable

   $ 1,742       $ 1,563   

Less allowance for doubtful accounts

     —           —    
  

 

 

    

 

 

 

Total accounts receivable, net

$ 1,742    $ 1,563   
  

 

 

    

 

 

 

As of December 31, 2014 and 2013, the Group’s accounts receivable include amounts earned and recognized as revenue of $963 and $1,503 but not yet billed (unbilled receivables), respectively. Management expects all unbilled receivables to be billed and collected within 12 months of the balance sheet date. There was no allowance needs to be accrued for the years ended December 31, 2014 and 2013, based on reviews of customer-specific facts and economic conditions.