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Stock-based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Stock      
Options granted during period 0 0 0
Stock Options      
Common Stock      
Outstanding, Beginning balance 1,807,515    
Options granted during period 0 0 0
Exercised (838,928)    
Forfeited and cancelled (25,702)    
Outstanding, Ending balance 942,885 1,807,515  
Options exercisable 913,197    
Weighted-Average Exercise Price for Equity      
Outstanding, Beginning balance $ 2.35    
Exercised 2.16    
Forfeited and cancelled 5.09    
Outstanding, Ending balance 2.45 $ 2.35  
Options exercisable $ 2.31    
Weighted-Average Remaining Contractual Life (In Years)      
Outstanding 5 years 5 years 10 months 24 days  
Options exercisable 5 years    
Aggregate Intrinsic Value      
Outstanding, Beginning balance [1] $ 56,716    
Exercised 28,902 [1] $ 111,227 $ 2,238
Outstanding, Ending balance [1] 30,859 $ 56,716  
Options exercisable [1] $ 30,016    
[1] The aggregate intrinsic value as of December 31, 2019 and 2018 was calculated based on the positive difference, if any, between the estimated fair value of our common stock on December 31, 2019 and 2018, respectively, or the date of exercise, as appropriate, and the exercise price of the underlying options