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Stock-Based Compensation - Summary of Stock Option Grants (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Granted Stock Options Outstanding (shares) | shares 6,843,585
Weighted- Average Remaining Contractual Life (Years) 6 years 4 months 20 days
Weighted-Average Exercise Price ($ per share) $ 8.98
Granted Stock Options Exercisable (shares) | shares 4,955,073
Weighted-Average Exercise Price ($ per share) $ 7.87
$1.03 - 3.16 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, range lower limit 1.03
Exercise price, range upper limit $ 3.16
Granted Stock Options Outstanding (shares) | shares 7,250
Weighted- Average Remaining Contractual Life (Years) 2 months 23 days
Weighted-Average Exercise Price ($ per share) $ 1.76
Granted Stock Options Exercisable (shares) | shares 7,250
Weighted-Average Exercise Price ($ per share) $ 1.76
$3.17 - 4.96 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, range lower limit 3.17
Exercise price, range upper limit $ 4.96
Granted Stock Options Outstanding (shares) | shares 212,880
Weighted- Average Remaining Contractual Life (Years) 4 years 3 months 8 days
Weighted-Average Exercise Price ($ per share) $ 4.22
Granted Stock Options Exercisable (shares) | shares 168,409
Weighted-Average Exercise Price ($ per share) $ 4.16
$4.97 - 6.91 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, range lower limit 4.97
Exercise price, range upper limit $ 6.91
Granted Stock Options Outstanding (shares) | shares 2,938,104
Weighted- Average Remaining Contractual Life (Years) 6 years 11 months 23 days
Weighted-Average Exercise Price ($ per share) $ 5.97
Granted Stock Options Exercisable (shares) | shares 2,029,420
Weighted-Average Exercise Price ($ per share) $ 5.90
$6.92 - 9.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, range lower limit 6.92
Exercise price, range upper limit $ 9.00
Granted Stock Options Outstanding (shares) | shares 1,914,493
Weighted- Average Remaining Contractual Life (Years) 5 years
Weighted-Average Exercise Price ($ per share) $ 7.75
Granted Stock Options Exercisable (shares) | shares 1,856,327
Weighted-Average Exercise Price ($ per share) $ 7.77
$9.01 - 22.64 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, range lower limit 9.01
Exercise price, range upper limit $ 22.64
Granted Stock Options Outstanding (shares) | shares 1,770,858
Weighted- Average Remaining Contractual Life (Years) 7 years 2 months 5 days
Weighted-Average Exercise Price ($ per share) $ 15.92
Granted Stock Options Exercisable (shares) | shares 893,667
Weighted-Average Exercise Price ($ per share) $ 13.27