NET LOSS PER SHARE - Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss	$ (524,403)	$ (161,237)	$ (1,534,081)	$ (408,105)
Deemed dividend related to the issuance of Series E convertible preferred stock	0	0	(2,167,332)	0
Net loss attributable to common stockholders	$ (524,403)	$ (161,237)	$ (3,701,413)	$ (408,105)
Weighted average shares outstanding - basic (in shares)	1,217,032,285	24,279,817	432,654,607	20,889,062
Weighted average shares outstanding - diluted (in shares)	1,217,032,285	24,279,817	432,654,607	20,889,062
Net loss per share - basic (in dollars per share)	$ (0.43)	$ (6.64)	$ (8.56)	$ (19.54)
Net loss per share - diluted (in dollars per share)	$ (0.43)	$ (6.64)	$ (8.56)	$ (19.54)