DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details) $ / shares in Units, $ in Thousands			9 Months Ended
	Aug. 31, 2021 shares	Aug. 02, 2021 USD ($) class $ / shares shares	Sep. 30, 2021 USD ($) class shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 shares
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock in connection with initial public offering, net of offering costs | $			$ 2,057,530	$ 0
Common stock, shares authorized (in shares)			0		777,354,000
Preferred stock, shares authorized (in shares)					0
Number of classes of common stock | class			3
IPO
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of common stock in connection with initial public offering, net of offering costs | $		$ 2,050,000
Underwriting discounts and commissions | $		90,800
Deferred offering costs | $		$ 12,600
Preferred stock, shares authorized (in shares)			210,000,000
Conversion of convertible preferred stock (in shares)		412,700,000
Conversion of convertible Common Stock (in shares)		233,300,000
Number of classes of common stock | class		3
Issuance of common stock upon settlement of restricted stock units, net of shares withheld | $		$ 1,010,000
Share-based payment arrangement, shares withheld for tax withholding obligation (in shares)		24,600,000
Common Class A
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)			21,000,000,000		0
Common Class A | IPO
Subsidiary, Sale of Stock [Line Items]
Shares issued in IPO (in shares)		55,000,000
Offering price in IPO (in dollars per share) | $ / shares		$ 38.00
Common stock, shares authorized (in shares)		21,000,000,000
Conversion of stock, shares converted (in shares)		130,200,000
Convertible notes converted to common stock (in shares)		137,300,000
Exercise price (in dollars per share) | $ / shares		$ 26.60
Aggregate warrants exercisable (in shares)		14,300,000
Restricted stock, shares issued for tax withholdings (In shares)		10,800,000
Common Class A | IPO - Shares from Existing Shareholders
Subsidiary, Sale of Stock [Line Items]
Shares issued in IPO (in shares)		2,600,000
Common Class A | Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Shares issued in IPO (in shares)	4,400,000
Common Class B
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)			700,000,000		0
Common Class B | IPO
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)		700,000,000
Common Class C
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)			7,000,000,000		0
Common Class C | IPO
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized (in shares)		7,000,000,000