Convertible Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2021
Class Of Stock [Line Items]
Convertible preferred stock shares issued		134,113,000			0
Gross proceeds from issuance of convertible preferred stock		$ 435,538	$ 223,739
Capital stock, shares authorized		707,000,000.0
Capital stock par value		$ 0.0001
Convertible preferred stock, shares authorized		537,786,000			0
Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized		169,200,000
Series A-1 Convertible Preferred Stock
Class Of Stock [Line Items]
Share issue price				$ 4.00
Convertible preferred stock shares issued				67,500,000
Gross proceeds from issuance of convertible preferred stock				$ 269,900
Series A-2 Convertible Preferred Stock
Class Of Stock [Line Items]
Share issue price			$ 4.00
Convertible preferred stock shares issued			67,500,000
Gross proceeds from issuance of convertible preferred stock			$ 269,900
Series B Convertible Preferred Stock
Class Of Stock [Line Items]
Share issue price	$ 16.00
Convertible preferred stock shares issued	27,200,000
Gross proceeds from issuance of convertible preferred stock	$ 435,500