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Share-based Compensation Expenses (Summary of Company's Option Activity under 2008 Plan) (Details) - 2008 Plan [Member] - Stock options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 08, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Options        
Outstanding as of beginning of the period (in shares)   21,265,846    
Granted (in shares) 2,159,812 14,369,000    
Exercised (in shares)   (4,732,482)    
Forfeited (in shares)   (820,553)    
Outstanding as of end of the period (in shares)   30,081,811 21,265,846  
Vested and expected to vest at end of the period (in shares)   28,908,784    
Exercisable at the end of the period (in shares)   9,537,339    
Weighted Average Exercise Price        
Outstanding as of beginning of the period (in dollars or RMB per share)   $ 1.17    
Granted (in dollars per share)   4.78    
Exercised (in dollars per share)   0.51    
Forfeited (in dollars per share)   3.21    
Outstanding as of end of the period (in dollars per share)   2.94 $ 1.17  
Vested and expected to vest at end of the period (in dollars per share)   2.90    
Exercisable at the end of the period (in dollars per shares)   $ 0.83    
Weighted Average Remaining Contractual Life        
Outstanding as of end of the period   7 years 4 days 4 years 10 months 17 days  
Vested and expected to vest at end of the period   6 years 11 months 12 days    
Exercisable at the end of the period   3 years 9 months 7 days    
Aggregate Intrinsic Value        
Outstanding as of end of the period   $ 71,711 $ 60,165  
Vested and expected to vest at end of the period   $ 70,063    
Exercisable at the end of the period (in shares)   42,853,000    
Weighted Average Grant Date Fair Value        
Granted (in dollars per share)   $ 2.40 $ 3.57 $ 0.90