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Stock-Based Compensation - Summary of Stock Option Grants (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Granted Stock Options Outstanding (shares) | shares 13,836,851
Weighted- Average Remaining Contractual Life (Years) 6 years 4 months 2 days
Weighted-Average Exercise Price ($ per share) $ 6.97
Granted Stock Options Exercisable (shares) | shares 10,235,721
Weighted-Average Exercise Price ($ per share) $ 6.94
$0.92 - 3.15  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Range lower limit 0.92
Exercise Price, Range upper limit $ 3.15
Granted Stock Options Outstanding (shares) | shares 1,090,385
Weighted- Average Remaining Contractual Life (Years) 2 years 5 months 28 days
Weighted-Average Exercise Price ($ per share) $ 2.18
Granted Stock Options Exercisable (shares) | shares 1,090,385
Weighted-Average Exercise Price ($ per share) $ 2.18
$3.16 - 4.95  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Range lower limit 3.16
Exercise Price, Range upper limit $ 4.95
Granted Stock Options Outstanding (shares) | shares 1,378,444
Weighted- Average Remaining Contractual Life (Years) 4 years 3 months 16 days
Weighted-Average Exercise Price ($ per share) $ 4.24
Granted Stock Options Exercisable (shares) | shares 1,378,444
Weighted-Average Exercise Price ($ per share) $ 4.24
$4.96 - 6.9  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Range lower limit 4.96
Exercise Price, Range upper limit $ 6.90
Granted Stock Options Outstanding (shares) | shares 4,394,294
Weighted- Average Remaining Contractual Life (Years) 6 years 1 month 20 days
Weighted-Average Exercise Price ($ per share) $ 6.08
Granted Stock Options Exercisable (shares) | shares 2,999,511
Weighted-Average Exercise Price ($ per share) $ 6.22
$6.91 - 8.99  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Range lower limit 6.91
Exercise Price, Range upper limit $ 8.99
Granted Stock Options Outstanding (shares) | shares 4,500,895
Weighted- Average Remaining Contractual Life (Years) 7 years 7 months 10 days
Weighted-Average Exercise Price ($ per share) $ 7.78
Granted Stock Options Exercisable (shares) | shares 2,595,943
Weighted-Average Exercise Price ($ per share) $ 7.95
$9.00 - 16.32  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Range lower limit 9.00
Exercise Price, Range upper limit $ 16.32
Granted Stock Options Outstanding (shares) | shares 2,472,833
Weighted- Average Remaining Contractual Life (Years) 7 years 2 months 14 days
Weighted-Average Exercise Price ($ per share) $ 10.71
Granted Stock Options Exercisable (shares) | shares 2,171,438
Weighted-Average Exercise Price ($ per share) $ 10.83