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Share-based Compensation (Share option activities) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
years
$ / shares
shares
Dec. 31, 2015
USD ($)
years
$ / shares
shares
Dec. 31, 2014
USD ($)
years
$ / shares
shares
Number of Options      
Number of Options, Outstanding, Beginning Balance | shares 46,117,530 50,267,007 39,770,121
Number of Options, Granted | shares 9,991,964 8,020,000 21,052,758
Number of Options, Forfeited and expired | shares (10,005,413) (8,379,197) (4,013,850)
Number of Options, Exercised | shares (1,658,946) (3,790,280) (6,542,022)
Number of Options, Outstanding, Ending Balance | shares 44,445,135 46,117,530 50,267,007
Number of Options, Exercisable | shares 12,802,895    
Number of Options, Vested and expected to vest | shares 30,349,765    
Weighted Average Exercise Price      
Weighted Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 0.81 $ 0.79 $ 0.44
Weighted Average Exercise Price, Granted | $ / shares 0.47 0.92 1.30
Weighted Average Exercise Price, Forfeited and expired | $ / shares 0.94 1.03 0.91
Weighted Average Exercise Price, Exercised | $ / shares 0.22 0.36 0.23
Weighted Average Exercise Price, Outstanding, Ending Balance | $ / shares 0.43 $ 0.81 $ 0.79
Weighted Average Exercise Price, Exercisable | $ / shares 0.29    
Weighted Average Exercise Price, Vested and expected to vest | $ / shares $ 0.40    
Weighted Average Remaining Contractual Life      
Weighted Average Remaining Contractual Life, Outstanding, Beginning Balance | years 7.5 8.2 8.1
Weighted Average Remaining Contractual Life, Outstanding, Ending Balance | years 7.1 7.5 8.2
Weighted Average Remaining Contractual Life, Exercisable | years 4.4    
Weighted Average Remaining Contractual Life, Vested and expected to vest | years 6.5    
Aggregate Intrinsic Value      
Aggregate Intrinsic Value, Outstanding, Beginning Balance | $ $ 7.6 $ 17.6 $ 30.2
Aggregate Intrinsic Value, Exercised | $ 0.4 1.5 7.1
Aggregate Intrinsic Value, Outstanding, Ending Balance | $ 1.8 $ 7.6 $ 17.6
Aggregate Intrinsic Value, Exercisable | $ 1.8    
Aggregate Intrinsic Value, Vested and expected to vest | $ $ 1.8