Organization and Description of Business (Details) $ / shares in Units, $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares	Jan. 31, 2019 USD ($) shares	Jan. 31, 2021 shares
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)		6,000,000.0
Net proceeds | $		$ 60,000
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)			(182,271,099)
Class A Common Stock | Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	4,200,000
Class A Common Stock | Private Placement
Subsidiary, Sale of Stock [Line Items]
Price per share (in dollars per share) | $ / shares	$ 120.00
Net proceeds | $	$ 500,000
Class A Common Stock | Private Placement | Salesforce Ventures LLC
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	2,083,333
Class A Common Stock | Private Placement | Berkshire Hathaway Inc.
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	2,083,333
Class A Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares issued (in shares)	32,200,000
Price per share (in dollars per share) | $ / shares	$ 120.00
Net proceeds | $	$ 3,700,000
Redeemable Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	(182,271,099)
Class B Common Stock
Subsidiary, Sale of Stock [Line Items]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	182,271,099
Conversion ratio	1