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Stock-Based Awards - Summary of Stock Option Plans Activity (Details) - Stock Option - 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 [Line Items]    
Number of Options,Outstanding, Beginning Balance 9,798,282  
Number of Options,Granted 2,346,030  
Number of Options,Exercised (497,226)  
Number of Options,Forfeited (234,088)  
Number of Options,Outstanding, Ending Balance 11,412,998 9,798,282
Number of Options,Vested and expected to vest 11,412,998  
Number of Options,Vested and exercisable 2,657,960  
Weighted Average Exercise Price, Beginning Balance $ 5.25  
Weighted Average Exercise Price, Granted 63.63  
Weighted Average Exercise Price, Exercised 4.73  
Weighted Average Exercise Price, Forfeited 26.91  
Weighted Average Exercise Price, Ending Balance 28.72 $ 5.25
Weighted Average Exercise Price,Vested and expected to vest 28.72  
Weighted Average Exercise Price,Vested and exercisable $ 7.32  
Weighted Average Remaining Contractual Term 8 years 8 months 12 days 8 years 7 months 6 days
Weighted Average Remaining Contractual Term,Vested and expected to vest 8 years 8 months 12 days  
Weighted Average Remaining Contractual Term,Vested and exercisable 7 years 7 months 6 days  
Aggregate Intrinsic Value, Balance $ 290,084  
Aggregate Intrinsic Value, Vested and expected to vest 290,084  
Aggregate Intrinsic Value, Vested and exercisable $ 116,812