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Equity Incentive Plans - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Balances at December 31, 2020 19,600,223,000  
Options granted 606,830,000  
Options exercised (521,511,000)  
Options cancelled and forfeited (94,771,000)  
Balances at March 31, 2021 19,590,771,000 19,600,223,000
Stock Options Weighted Average Exercise Price Per Share    
Options outstanding, Weighted average exercise price per share - December 31, 2020 (in dollars per share) $ 4,270  
Options outstanding, Weighted average exercise price per share - March 31, 2021 (in dollars per share) $ 7,420 $ 4,270
Stock Option Activity, Additional Disclosures    
Options outstanding, Weighted average remaining contractual term 6 years 7 months 6 days 6 years 9 months 18 days
Options outstanding, Aggregate intrinsic value (in dollars) $ 2,379,126 $ 715,084
Options exercisable, Number of options 11,309,977,000  
Options exercisable, Weighted average exercise price per share (in dollars per share) $ 1,650  
Options exercisable, Weighted average remaining contractual term 4 years 10 months 24 days  
Options exercisable, Aggregate intrinsic value (in dollars) $ 1,438,789  
Options vested and expected to vest 19,168,127,000  
Options vested and expected to vest, Weighted Average Exercise Price Per Share (in dollars per share) $ 6,950  
Options vested and expected to vest, Weighted average remaining contractual term 6 years 6 months  
Options vested and expected to vest, Aggregate intrinsic value (in dollars) $ 2,336,779