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Accounts receivable, net
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Accounts receivable, net

6. Accounts receivable, net

Accounts receivable consist of the following:

 

     As of December 31,  
     2012      2013  

Accounts receivable

    $ —         $ 1,563   

Less allowance for doubtful accounts

      —           —     
  

 

 

     

 

 

  

Total accounts receivable, net

    $ —         $ 1,563   
  

 

 

     

 

 

  

As of December 31, 2013, the Group’s accounts receivable include amounts earned and recognized as revenue of $1,503 but not yet billed (unbilled receivables). Management expects all unbilled receivables to be billed and collected within 12 months of the balance sheet date.