ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Accumulated deficit	$ 1,328,698	$ 980,597
Cash and cash equivalents, and investment securities	350,300
Restricted cash pledge	1,300	1,300
Impairment to goodwill	0
Prepaid research and development	$ 11,929	$ 5,231