Convertible Preferred Stock - Summary of Preferred Stock (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Preferred Stock Authorized 0 155,387,025 155,387,025
Preferred Stock Issued 0 139,444,346 139,444,346
Preferred Stock Outstanding 0 139,444,346 139,444,346
Liquidation preference $ 0 $ 470,256  
After Reverse Capitalization [Member]      
Class of Stock [Line Items]      
Preferred Stock Authorized   155,387,025 155,387,025
Preferred Stock Issued   139,444,346 139,444,346
Preferred Stock Outstanding   139,444,346 139,444,346
Carrying Value   $ 447,800 $ 447,800
Liquidation preference   $ 470,300 $ 470,300
Common Stock Issuable Upon Conversion    139,444,346  
Series A Preferred stock [Member] | After Reverse Capitalization [Member]      
Class of Stock [Line Items]      
Preferred Stock Authorized   10,907,993 10,907,993
Preferred Stock Issued   10,907,993 10,907,993
Preferred Stock Outstanding   10,907,993 10,907,993
Carrying Value   $ 5,500 $ 5,500
Liquidation preference   $ 5,500 $ 5,500
Common Stock Issuable Upon Conversion    10,907,993 10,907,993
Series A-1 Preferred stock [Member] | After Reverse Capitalization [Member]      
Class of Stock [Line Items]      
Preferred Stock Authorized   14,888,608 14,888,608
Preferred Stock Issued   14,888,608 14,888,608
Preferred Stock Outstanding   14,888,608 14,888,608
Carrying Value   $ 7,500 $ 7,500
Liquidation preference   $ 30,000 $ 30,000
Common Stock Issuable Upon Conversion    14,888,608 14,888,608
Series B Preferred stock [Member] | After Reverse Capitalization [Member]      
Class of Stock [Line Items]      
Preferred Stock Authorized   21,381,446 21,381,446
Preferred Stock Issued   21,381,446 21,381,446
Preferred Stock Outstanding   21,381,446 21,381,446
Carrying Value   $ 35,000 $ 35,000
Liquidation preference   $ 35,000 $ 35,000
Common Stock Issuable Upon Conversion    21,381,446 21,381,446
Series C Preferred stock [Member] | After Reverse Capitalization [Member]      
Class of Stock [Line Items]      
Preferred Stock Authorized   39,431,582 39,431,582
Preferred Stock Issued   39,431,582 39,431,582
Preferred Stock Outstanding   39,431,582 39,431,582
Carrying Value   $ 160,200 $ 160,200
Liquidation preference   $ 160,200 $ 160,200
Common Stock Issuable Upon Conversion    39,431,582 39,431,582
Series D Preferred stock [Member] | After Reverse Capitalization [Member]      
Class of Stock [Line Items]      
Preferred Stock Authorized   68,777,396 68,777,396
Preferred Stock Issued   52,834,717 52,834,717
Preferred Stock Outstanding   52,834,717 52,834,717
Carrying Value   $ 239,600 $ 239,600
Liquidation preference   $ 239,600 $ 239,600
Common Stock Issuable Upon Conversion    52,834,717 52,834,717