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Convertible Preferred Stock - Summary of Convertible Preferred Stock (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jul. 08, 2020
Dec. 31, 2019
Class Of Stock [Line Items]      
Preferred stock shares authorized     337,272,859
Preferred stock shares issued     212,642,857
Preferred stock shares outstanding 0   212,642,857
Carrying value     $ 537,781
Liquidation preference     $ 519,825
Common stock issuable upon conversion   37,206,604 59,883,877
Series A Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock shares authorized     56,824,740
Preferred stock shares issued     56,824,740
Preferred stock shares outstanding     56,824,740
Carrying value     $ 75,657
Liquidation preference     $ 56,825
Common stock issuable upon conversion     16,002,820
Series B Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock shares authorized     31,188,115
Preferred stock shares issued     31,188,115
Preferred stock shares outstanding     31,188,115
Carrying value     $ 62,876
Liquidation preference     $ 63,000
Common stock issuable upon conversion     8,783,102
Series C Preferred Stock [Member]      
Class Of Stock [Line Items]      
Preferred stock shares authorized     249,260,004
Preferred stock shares issued     124,630,002
Preferred stock shares outstanding     124,630,002
Carrying value     $ 399,248
Liquidation preference     $ 400,000
Common stock issuable upon conversion     35,097,955