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Stockholders' Equity and Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Number of Options    
Outstanding, beginning of period (in shares) 3,358  
Options exercised (in shares) (452)  
Options canceled (in shares) (2)  
Outstanding, end of period (in shares) 2,904 3,358
Weighted-Average Exercise Price    
Outstanding, beginning of period (in dollars per share) $ 1.53  
Options exercised (in dollars per share) 1.27  
Options canceled (in dollars per share) 4.79  
Outstanding, end of period (in dollars per share) $ 1.56 $ 1.53
Outstanding, Weighted average remaining contractual term (years) 5 years 1 month 6 days 5 years 3 months 18 days
Outstanding, Aggregate intrinsic value $ 89,554 $ 104,510
Options exercisable at end of period    
Options exercisable (in shares) 2,408  
Weighted average exercise price (in dollars per share) $ 1.15  
Weighted average remaining contractual term (years) 4 years 9 months 18 days  
Aggregate intrinsic value $ 75,265  
Options vested as of end of period and expected to vest after end of period    
Options vested and expected to vest (in shares) 2,904  
Weighted average exercise price (in dollars per share) $ 1.56  
Weighted-Average Remaining Contractual Term (Years) 5 years 1 month 6 days  
Aggregate Intrinsic Value $ 89,554