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

 

(In thousands)

    December 31,
2013		      December 31,
2014		  

Accounts receivable

      47,386         38,273   

Less: Allowance for doubtful accounts

      (12,111 )       (9,352 ) 
  

 

 

     

 

 

  

Accounts receivable, net

   35,275      28,921   
  

 

 

     

 

 

  

The accounts receivable that was fully reserved as of December 31, 2013 and 2014 was USD 10.9 million and USD 8.9 million, respectively.

The following table presents movement in the allowance for doubtful accounts:

 

(In thousands)

    December 31,
2012		      December 31,
2013		      December 31,
2014		  

Balance at beginning of the year

      4,150         7,875         12,111   

Additions

      3,840         4,308         2,633   

Reversals

      (140 )       (373 )       (1,176 ) 

Write-off

      —           —           (4,161 ) 

Exchange difference

      25         301         (55 ) 
  

 

 

     

 

 

     

 

 

  

Balance at end of the year

   7,875      12,111      9,352   
  

 

 

     

 

 

     

 

 

  

The top 10 customers accounted for about 40% and 37% of accounts receivable as of December 31, 2013 and 2014, respectively.