LEASES - SUMMARY OF RIGHT OF USE ASSETS AND LEASE LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Right-of-use assets	$ 1,439	$ 1,607
Liabilities
Operating lease liabilities - current	1,365	1,382
Operating lease liabilities - long-term	1,351	1,677
Total lease liabilities	$ 2,716	$ 3,059