CONVERTIBLE PREFERRED STOCK - Schedule of Proceeds from Series D Preferred Stock (Details) - USD ($) $ in Thousands	1 Months Ended					3 Months Ended		12 Months Ended		45 Months Ended
	Feb. 28, 2021	Jun. 30, 2020	Mar. 31, 2020	Oct. 31, 2019	Apr. 30, 2019	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2019	Sep. 30, 2021
Class of Stock [Line Items]
Conversion of preferred stock warrant to Series D in February 2021	$ 3,000							$ 173,300
Series D
Class of Stock [Line Items]
Conversion of convertible notes									$ 272,000	$ 271,985
Proceeds from issuance of convertible preferred stock		$ 200,000	$ 200,000	$ 400,000	$ 200,000	$ 0	$ 3,000
Contingent forward contract liability reclassified to Series D		$ 21,384	$ 18,180
Conversion of preferred stock warrant to Series D in February 2021	3,000
Reclassification of preferred stock warrant liability to Series D in February 2021	$ 9,936
Total proceeds of Series D										$ 1,324,485