GENERAL ORGANIZATION, BUSINESS AND LIQUIDITY (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
GENERAL ORGANIZATION, BUSINESS AND LIQUIDITY
Net loss	$ (99,618)	$ (86,122)	$ (290,574)	$ (242,922)
Net cash used in operating activities			(215,086)	(174,092)
Cash equivalents, short-term investments, and restricted cash	366,600		366,600
Cash and cash equivalents	118,366	58,590	118,366	58,590	$ 78,229
Short-term investments	241,807		241,807		426,181
Long-term investments	0		0		91,588
Restricted cash	$ 6,430	$ 6,084	$ 6,430	$ 6,084	$ 6,084