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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of options      
Outstanding at the beginning of the period (in shares) 768,375 7,380,345 13,222,005
Exercised (in shares) (234,720) (6,611,970) (5,841,660)
Outstanding, vested and exercisable at the end of the period (in shares) 533,655    
Weighted average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 0.0067 $ 0.0061 $ 0.0059
Exercised (in dollars per share) 0.0067 $ 0.0061 $ 0.0057
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 2 years 11 months 26 days 3 years 6 months 7 days 4 years 4 months 24 days
Exercised 2 years 2 years 5 months 16 days 3 years 2 months 26 days
Outstanding, vested and exercisable at the end of the period 1 year 11 months 23 days    
Aggregate intrinsic value      
Outstanding at the end of the period $ 2,395 $ 22,959 $ 33,162
Outstanding, vested and exercisable, December 31, 2016 $ 1,048