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Accounts receivables, net and other receivables (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts receivables, net and other receivables      
Trade receivables, net of allowances $ 10,977 $ 7,382  
Unbilled platform service arrangements, current   68  
Unbilled access fees   1,985  
Unbilled platform service arrangements 396 166  
Non-current other receivables 396 2,151  
Allowance for doubtful accounts      
Balance at the beginning of the period 177 107 617
Additions charged to operations 45 115 44
Deductions from reserves, net (43) (45) (554)
Balance at the end of the period $ 179 $ 177 $ 107