OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Other Liabilities Disclosure [Abstract]
Operating lease liabilities	$ 12,281	$ 19,707	$ 28,800
Income tax liabilities	12,414	10,935
Deferred revenue	504	88
Other non-current liabilities	40	286
Total	$ 25,239	$ 31,016