CONVERTIBLE PREFERRED STOCK - Schedule of Convertible Preferred Shares (Details) $ / shares in Units, $ in Thousands	Dec. 31, 2021 USD ($) shares		Jul. 22, 2021 shares	Feb. 28, 2021 shares	Dec. 31, 2020 USD ($) $ / shares shares		Dec. 31, 2019 USD ($) shares		Dec. 31, 2018 USD ($) shares
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares) | shares	0			1,155,909,398	1,058,949,780
Convertible preferred stock, shares outstanding (in shares) | shares	0	[1]	437,182,072		957,159,704	[1]	502,582,534	[1]	137,248,112	[1]
Net Carrying Value | $	$ 0				$ 2,494,076		$ 1,074,010		$ 259,960
Convertible preferred stock, liquidation preference amount | $	$ 0				$ 3,497,913
Series A
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares) | shares					32,045,280
Convertible preferred stock, shares outstanding (in shares) | shares					32,045,280
Net Carrying Value | $					$ 11,925
Conversion Per Share to Common Stock					0.38
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares					$ 0.38
Convertible preferred stock, liquidation preference amount | $					$ 12,120
Series B
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares) | shares					24,677,332
Convertible preferred stock, shares outstanding (in shares) | shares					24,677,332
Net Carrying Value | $					$ 23,740
Conversion Per Share to Common Stock					1.13
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares					$ 1.13
Convertible preferred stock, liquidation preference amount | $					$ 28,000
Convertible preferred stock, shares cancelled (in shares) | shares					3,525,332
Convertible preferred stock, shares cancelled, fair value | $					$ 3,000
Series C
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares) | shares					82,414,075
Convertible preferred stock, shares outstanding (in shares) | shares					59,575,253
Net Carrying Value | $					$ 137,475
Conversion Per Share to Common Stock					2.42
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares					$ 2.42
Convertible preferred stock, liquidation preference amount | $					$ 144,432
Series D
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares) | shares					618,720,748
Convertible preferred stock, shares outstanding (in shares) | shares					539,769,493
Net Carrying Value | $					$ 1,311,548
Conversion Per Share to Common Stock					2.33
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares					$ 3.64
Convertible preferred stock, liquidation preference amount | $					$ 1,963,912
Series E
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares) | shares					301,092,345
Convertible preferred stock, shares outstanding (in shares) | shares					301,092,346
Net Carrying Value | $					$ 1,009,388
Conversion Per Share to Common Stock					2.99
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares					$ 4.48
Convertible preferred stock, liquidation preference amount | $					$ 1,349,449

[1] The number of shares of convertible preferred stock and common stock issued and outstanding prior to the Merger have been retroactively adjusted by the Exchange Ratio to give effect to the reverse recapitalization treatment of the Merger. See Note 1 - Description of Business and Note 3 - Reverse Capitalization for more information.