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Stock Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares Outstanding Under the Plan      
Options granted (in shares) 47,841,859    
Stock Options      
Number of Shares Available for Issuance Under the Plan      
Balance at the beginning (in shares) 2,880,358 3,855,385  
Additional shares authorized (in shares) 62,903,028    
Options granted (in shares) (36,074,010)    
Options exercised (in shares) 0    
Options canceled (in shares) 5,791,227 (975,027)  
Balance at the end (in shares) 35,500,603 2,880,358 3,855,385
Number of Shares Outstanding Under the Plan      
Balance at the beginning (in shares) 28,983,226 38,794,307  
Options granted (in shares) 35,732,754    
Options exercised (in shares) (20,138,817)    
Options canceled (in shares) (6,172,670) (9,811,081)  
Balance at the end (in shares) 38,404,493 28,983,226 38,794,307
Exercisable at the end (in shares) 14,248,234 15,225,162  
Unvested at the end (in shares) 24,156,259 13,758,064  
Weighted-Average Exercise Price      
Balance at the beginning (in dollars per shares) $ 0.19 $ 0.14  
Options granted (in dollars per shares) 6.70    
Options exercised (in dollars per shares) 0.78    
Options canceled (in dollars per shares) 0.51 0.05  
Balance at the end (in dollars per shares) 5.89 0.19 $ 0.14
Exercisable at the end (in dollars per shares) 0.18 0.08  
Unvested at the end (in dollars per shares) $ 9.25 $ 0.31  
Weighted-Average Remaining Contractual Term (Years) and Aggregate Intrinsic Value      
Weighted average remaining contractual life, outstanding 8 years 3 months 7 days 7 years 8 months 1 day 7 years 8 months 1 day
Exercisable at the end (in years) 6 years 5 months 12 days 6 years 10 months 6 days  
Unvested at the end (in years) 9 years 4 months 2 days 8 years 6 months 29 days  
Aggregate intrinsic value outstanding $ 542,074 $ 13,056 $ 13,056
Exercisable at the end (in dollars) $ 282,364 $ 8,492  
Unvested at the end (in dollars) 259,710,000 4,564,000  
Shares of restricted common stock issued upon the early exercise of the Executive grants 13,300,000 8,200,000  
Unrecognized stock-based compensation expense $ 156,900    
Unrecognized stock-based compensation expense, weighted-average period of recognition 3 years 6 months 11 days    
Aggregate intrinsic value of options exercised $ 89,900 $ 1,400 $ 500
Restricted stock units      
Number of Shares Outstanding Under the Plan      
Balance at the beginning (in shares) 0    
Options granted (in shares) 341,256    
Balance at the end (in shares) 341,256 0  
Restricted stock units | Weighted Average Grant Date Fair Value Per Share Member      
Weighted-Average Exercise Price      
Options granted (in dollars per shares) $ 17.68    
Unvested at the end (in dollars per shares) $ 17.68