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Accounts receivables, net and other receivables (Tables)
 12 Months Ended
Dec. 31, 2013
Accounts receivables, net and other receivables  
Schedule of accounts receivable, net of allowances for doubtful accounts and other receivables

 

 

 
   December 31,  
 
   2013   2012  

Trade receivables, net of allowances

   $ 12,799   $ 10,977  

Unbilled access fees

     2,036     1,957  

Unbilled platform service arrangements

     1,491     109  
           
​ ​ ​ ​ ​ ​ ​ ​

Accounts receivable, net

   $ 16,326   $ 13,043  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           

Unbilled access fees

   $ 264   $ 838  

Unbilled platform service arrangements

     16     287  
           
​ ​ ​ ​ ​ ​ ​ ​

Non-current other receivables

   $ 280   $ 1,125  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Schedule of allowance for doubtful accounts

 

 

 
   Allowance for Doubtful Accounts  

Balance, December 31, 2010

   $ 107  

Additions charged to operations

     115  

Deductions from reserves, net

     (45 )
       
​ ​ ​ ​ ​

Balance, December 31, 2011

     177  

Additions charged to operations

     45  

Deductions from reserves, net

     (43 )
       
​ ​ ​ ​ ​

Balance, December 31, 2012

     179  

Additions charged to operations

     209  

Deductions from reserves, net

     (43 )
       
​ ​ ​ ​ ​

Balance, December 31, 2013

   $ 345  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​