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Other income, net (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Schedule of Other Income, Net
     Years ended December 31,  

(In thousands)

    2012      2013      2014  

Subsidy income

      1,621         1,393         2,236   

Fair value changes of warrants liabilities (note 14)

      (710 )       1,531         8,054   

Investment income from short-term investments

      2         1,847         3,471   

Dilution gains arising from deemed disposal of investment (Note 10)

      —           —           449   

Exchange losses

      (351 )       (252 )       (176 ) 

Others

      2         160         (68 ) 
  

 

 

     

 

 

     

 

 

  
  564      4,679      13,966