OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Operating lease liabilities	$ 8,545	$ 12,281
Income tax liabilities	12,314	12,414
Deferred revenue	247	504
Other non-current liabilities	79	40
Total	$ 21,185	$ 25,239