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2017, 2018 and 2020 Warrants - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 02, 2020
Jun. 24, 2019
Mar. 31, 2021
Mar. 31, 2020
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     $ (46,649) $ (309)   $ (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 15,757,955     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%