COMMON STOCK WARRANT LIABILITY - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jul. 23, 2021	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2017
Class of Warrant or Right [Line Items]
Number of warrants (in shares)	85,750,000			2
Sponsor earnback warrants (in shares)	14,783,333		14,783,333
Sponsor earnback warrants vested (in shares)			14,783,333
Private Placement Warrants
Class of Warrant or Right [Line Items]
Number of warrants (in shares)	44,350,000
Convertible preferred stock warrant liability	$ 812.0	$ 871.5	$ 1,394.8
Change in fair value of preferred stock warrant liability		$ 523.3