DESCRIPTION OF BUSINESS (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Description of Business and Basis of Presentation [Line Items]
Accumulated deficit	$ (620,571)	$ (605,643)
Cash and cash equivalents	18,862	$ 38,704
CASI China
Description of Business and Basis of Presentation [Line Items]
Cash and cash equivalents	$ 13,400