Convertible Preferred Stock - Schedule of Preferred Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Preferred Stock Authorized		79,398,350
Preferred Stock Issued		59,398,350
Preferred Stock Outstanding		59,398,350
Carrying Value		$ 173,127
Liquidation Value		$ 188,034
Common Stock Issuable Upon Conversion		39,859,139
Series A1 Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Authorized		20,000,000
Series A2 Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Authorized		20,000,000
Preferred Stock Issued		20,000,000
Preferred Stock Outstanding		20,000,000
Carrying Value		$ 29,775
Liquidation Value		$ 30,000
Common Stock Issuable Upon Conversion		13,420,970
Series A3 Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Authorized		22,453,987
Preferred Stock Issued		22,453,987
Preferred Stock Outstanding		22,453,987
Carrying Value		$ 19,364
Liquidation Value		$ 33,681
Common Stock Issuable Upon Conversion		15,067,706
Series A4 Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Authorized		2,066,666
Preferred Stock Issued		2,066,666
Preferred Stock Outstanding		2,066,666
Carrying Value		$ 3,065
Liquidation Value		$ 3,100
Common Stock Issuable Upon Conversion		1,386,831
Series B Preferred Stock
Class Of Stock [Line Items]
Preferred Stock Authorized	0	14,877,697
Preferred Stock Issued	0	14,877,697
Preferred Stock Outstanding	0	14,877,697
Carrying Value		$ 120,923
Liquidation Value		$ 121,253
Common Stock Issuable Upon Conversion		9,983,632