GENERAL ORGANIZATION, BUSINESS AND LIQUIDITY (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
GENERAL ORGANIZATION, BUSINESS AND LIQUIDITY
Net loss	$ (99,349)	$ (81,351)	$ (190,956)	$ (156,800)
Net cash used in operating activities			(151,437)	(116,399)
Cash equivalents, short-term investments, and restricted cash	430,900		430,900
Cash and cash equivalents	108,075	82,763	108,075	82,763	$ 78,229
Short-term investments	316,383		316,383		426,181
Long-term investments	0		0		91,588
Restricted cash	$ 6,430	$ 6,084	$ 6,430	$ 6,084	$ 6,084