OTHER LONG-TERM ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Investment, net	$ 1,579	$ 1,579
Operating lease right-of-use assets	1,775	1,955
Deposits	1,353	1,936
Other	940	1,031
Total other long-term assets	5,647	$ 6,501
Long-term investment	3,500
Long-term investment, expected credit loss	$ 1,900