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Share based compensation (Summary of Activities of Pre-2009 Scheme Options for Employees and Non-employee) (Details) - Share options [Member] - Pre-2009 Scheme Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Number of options        
Outstanding at the beginning of the period (in shares) 7,380,345 13,222,005 17,870,425  
Exercised/Repurchased (in shares) (6,611,970) (5,841,660) (4,648,420)  
Outstanding at the end of the period (in shares)   7,380,345 13,222,005 17,870,425
Outstanding, vested and exercisable at the end of the period (in shares) 768,375      
Weighted average exercise price        
Outstanding at the beginning of the period (in dollars per share) $ 0.0061 $ 0.0059 $ 0.0055  
Exercised/Repurchased (in dollars per share) 0.0061 0.0057 0.0045  
Outstanding at the end of the period (in dollars per share)   $ 0.0061 $ 0.0059 $ 0.0055
Outstanding, vested and exercisable at the end of the period (in dollars per share) $ 0.0067      
Weighted average remaining contractual life        
Outstanding at the end of the period     4 years 4 months 24 days 5 years 4 months 13 days
Exercised 2 years 5 months 16 days 3 years 2 months 26 days 4 years 3 months 18 days  
Outstanding, vested and exercisable at the end of the period 2 years 11 months 26 days 3 years 6 months 7 days    
Aggregate intrinsic value        
Outstanding at the end of the period     $ 33,162 $ 12,642
Outstanding, vested and exercisable at the end of the period $ 2,395 $ 22,959