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2017, 2018 and 2020 Warrants - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 02, 2020
Jun. 24, 2019
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Jun. 06, 2020
Class of Warrant or Right [Line Items]            
Period for financing to occur before warrant becomes exercisable for a SAFE       2 years    
Change in fair value of warrant liabilities       $ (268,266) $ (256)  
Class A Common Stock | Common Stock            
Class of Warrant or Right [Line Items]            
Conversion of SAFE into Series A common stock or Issuance of Class A common stock upon exercise of warrants (in shares) 1,466,155 3,612,062   1,466,155 3,612,062  
2017, 2018, And 2020 Warrants            
Class of Warrant or Right [Line Items]            
Change in fair value of warrant liabilities       $ 27,300 $ 256  
Warrants outstanding (in shares)       0    
2017 Warrants            
Class of Warrant or Right [Line Items]            
Number of shares available for purchase, percentage of principal advances under 2017 Note       10.00%    
Number of shares available for purchase, calculation benchmark, percentage of price per share for equity securities issued       70.00%    
Period for financing to occur before warrant becomes exercisable for a SAFE       2 years    
Warrants exercisable for a SAFE, invested amount, percentage of advances under 2017 Note       10.00%    
2020 Warrants            
Class of Warrant or Right [Line Items]            
Number of shares available for purchase, percentage of principal advances under 2017 Note           10.00%
Warrant coverage percentage     10.00%