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Stockholders' Equity - Summary of Stock Options Outstanding (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding (shares) | shares 8,752,677
Weighted-Average Remaining Contractual Life (in Years) 6 years 7 months 31 days
Weighted average exercise price ($ per share) $ 6.35
Options exercisable (shares) | shares 6,154,495
Weighted-average exercise price ($ per share) $ 6.78
$1.48-$3.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 1.48
Exercise price, upper range limit $ 3
Options outstanding (shares) | shares 879,321
Weighted-Average Remaining Contractual Life (in Years) 3 years 7 months 31 days
Weighted average exercise price ($ per share) $ 2.26
Options exercisable (shares) | shares 879,321
Weighted-average exercise price ($ per share) $ 2.26
$3.01-$6.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 3.01
Exercise price, upper range limit $ 6
Options outstanding (shares) | shares 2,558,453
Weighted-Average Remaining Contractual Life (in Years) 7 years 10 months 30 days
Weighted average exercise price ($ per share) $ 4.38
Options exercisable (shares) | shares 974,723
Weighted-average exercise price ($ per share) $ 4.44
$6.01-$9.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 6.01
Exercise price, upper range limit $ 9
Options outstanding (shares) | shares 4,394,357
Weighted-Average Remaining Contractual Life (in Years) 6 years 7 months 31 days
Weighted average exercise price ($ per share) $ 7.11
Options exercisable (shares) | shares 3,408,953
Weighted-average exercise price ($ per share) $ 7.20
$9.01-$12.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 9.01
Exercise price, upper range limit $ 12
Options outstanding (shares) | shares 257,836
Weighted-Average Remaining Contractual Life (in Years) 6 years 10 months 30 days
Weighted average exercise price ($ per share) $ 9.79
Options exercisable (shares) | shares 228,788
Weighted-average exercise price ($ per share) $ 9.81
$12.01-$15.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 12.01
Exercise price, upper range limit $ 15
Options outstanding (shares) | shares 662,710
Weighted-Average Remaining Contractual Life (in Years) 5 years 2 months 28 days
Weighted average exercise price ($ per share) $ 12.96
Options exercisable (shares) | shares 662,710
Weighted-average exercise price ($ per share) $ 12.96