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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares Issuable Under Options      
Outstanding, beginning balance 91,403 49,798  
Granted 2,191,462 42,244  
Options assumed in connection with acquisition 1,346,398    
Forfeited / Canceled (7,784) (639)  
Outstanding, ending balance 3,621,479 91,403 49,798
Options vested and expected to vest as of December 31, 2020 3,621,479    
Options exercisable as of December 31, 2020 878,033    
Weighted Average Exercise Price      
Outstanding, beginning balance $ 139.96 $ 233.45  
Granted 9.15 28.87  
Options assumed in connection with acquisition 7.58    
Forfeited / Canceled 586.16 79.38  
Outstanding, ending balance 10.63 $ 139.96 $ 233.45
Options vested and expected to vest as of December 31, 2020 15.21    
Options exercisable as of December 31, 2020 $ 16.00    
Weighted Average Remaining Contractual Term (In years)      
Outstanding, balance 8 years 10 months 24 days 8 years 2 months 12 days 8 years 1 month 6 days
Options vested and expected to vest as of December 31, 2020 8 years 10 months 24 days    
Options exercisable as of December 31, 2020 8 years 2 months 12 days    
Aggregate Intrinsic Value      
Aggregate intrinsic value, Outstanding $ 23,938,701    
Options vested and expected to vest as of December 31, 2020 23,938,701    
Options exercisable as of December 31, 2020 $ 6,297,510