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Stock-Based Compensation - Summary of Stock Option Grants (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Granted Stock Options Outstanding (shares) | shares 14,340,582
Weighted- Average Remaining Contractual Life (Years) 5 years 8 months 15 days
Weighted-Average Exercise Price ($ per share) $ 6.86
Granted Stock Options Exercisable (shares) | shares 11,206,200
Weighted-Average Exercise Price ($ per share) $ 6.99
$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) 1 year 5 months 26 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 1,422,320
Weighted- Average Remaining Contractual Life (Years) 3 years 7 months 6 days
Weighted-Average Exercise Price ($ per share) $ 4.24
Granted Stock Options Exercisable (shares) | shares 1,349,320
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 5,413,364
Weighted- Average Remaining Contractual Life (Years) 6 years 2 months 18 days
Weighted-Average Exercise Price ($ per share) $ 6.09
Granted Stock Options Exercisable (shares) | shares 3,323,866
Weighted-Average Exercise Price ($ per share) $ 6.21
$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 4,000,514
Weighted- Average Remaining Contractual Life (Years) 6 years 7 months 12 days
Weighted-Average Exercise Price ($ per share) $ 7.78
Granted Stock Options Exercisable (shares) | shares 3,038,641
Weighted-Average Exercise Price ($ per share) $ 7.87
$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 2,413,999
Weighted- Average Remaining Contractual Life (Years) 6 years 2 months 15 days
Weighted-Average Exercise Price ($ per share) $ 10.68
Granted Stock Options Exercisable (shares) | shares 2,403,988
Weighted-Average Exercise Price ($ per share) $ 10.69