Convertible Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2021	Feb. 28, 2021
Class Of Stock [Line Items]
Convertible preferred stock shares issued		134,113,000			0
Gross proceeds from issuance of convertible preferred stock	$ 435,543
Outstanding shares of convertible preferred stock converted into shares of common stock						134,100,000
Convertible preferred stock outstanding		134,113,000			0
Series A-1 Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock shares issued				11,500,000
Share price				$ 4.00
Gross proceeds from issuance of convertible preferred stock				$ 45,900
Series A-2 Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock shares issued			56,000,000.0
Share price			$ 4.00
Gross proceeds from issuance of convertible preferred stock			$ 224,000
Series B Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock shares issued		27,200,000
Share price		$ 16.00
Gross proceeds from issuance of convertible preferred stock		$ 435,600
Convertible Preferred Stock
Class Of Stock [Line Items]
Convertible preferred stock outstanding	134,113,000	134,113,000	106,890,000		0