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Stock-Based Compensation - Number of Shares Available for Issuance (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of shares available for issuance          
Outstanding number of shares available for issuance at the beginning of the year (in shares)   20,217,000 2,738,000 4,648,000  
Addition (in shares)     21,684,000 1,000,000  
Granted (in shares)   (1,917,000) (4,851,000) (2,951,000)  
Cancelled/expired/forfeited (in shares)   578,000 646,000 41,000  
Outstanding number of shares available for issuance at the end of the year (in shares)   18,878,000 20,217,000 2,738,000 4,648,000
Aggregate Intrinsic Value          
Fair value per ordinary share (in dollars per share)   $ 40.60 $ 19.50 $ 14.24  
2014 Plan          
Number of shares available for issuance          
Addition (in shares) 1,000,000        
Stock options          
Options Outstanding          
Outstanding at the beginning of the year (in shares)   6,303,000 14,330,000 18,561,000  
Exercise (in shares)   (3,625,000) (7,309,000) (3,697,000)  
Cancelled/expired/forfeited (in shares)   (91,000) (718,000) (534,000)  
Outstanding at the end of the year (in shares)   2,587,000 6,303,000 14,330,000 18,561,000
Vested and expected to vest at the end of the year (in shares)   2,572,000 6,237,000    
Exercisable at the end of the year (in shares)   2,433,000 5,649,000    
Weighted Average Exercise Price          
Outstanding at the beginning of the year (in dollars per share)   $ 1.26 $ 1.28 $ 1.17  
Exercise (in dollars per share)   1.10 1.11 0.52  
Cancelled/expired/forfeited (in dollars per share)   3.37 3.22 2.84  
Outstanding at the end of the year (in dollars per share)   1.41 1.26 $ 1.28 $ 1.17
Vested and expected to vest at the end of the year (in dollars per share)   1.40 1.24    
Exercisable at the end of the year (in dollars per share)   $ 1.28 $ 1.01    
Weighted Average Remaining Contractual Life (in years)          
Outstanding at the end of the year   1 year 7 months 6 days 2 years 4 months 24 days 3 years 2 months 12 days 4 years 3 months 18 days
Vested and expected to vest at the end of the year   1 year 7 months 6 days 2 years 4 months 24 days    
Exercisable at the end of the year   1 year 4 months 24 days 2 years 2 months 12 days    
Aggregate Intrinsic Value          
Outstanding at the end of the year   $ 101,403 $ 114,975 $ 185,684 $ 239,975
Vested and expected to vest at the end of the year   100,819 113,909    
Exercisable at the end of the year   95,678 104,473    
Total intrinsic value of options exercised   129,300 106,200 65,700  
Cash received from the exercise of stock option   4,200 7,800 $ 1,500  
Unrecognized compensation cost   $ 1,100 $ 3,900    
Weighted-average period of unrecognized compensation cost   9 months 18 days      
Stock options | 2014 Plan          
Options Outstanding          
Granted (in shares)   0 0 0  
Restricted share units          
Number of shares available for issuance          
Restricted shares units granted (in shares)   1,900,000 4,900,000 3,000,000