LEASES - Summary of Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Assets
Operating lease, right-of-use asset	$ 2,202	$ 4,048
Liabilities
Operating lease liabilities - current	1,150	1,157
Operating lease liabilities - long-term	2,664	3,693
Total lease liabilities	$ 3,814	$ 4,850