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COMMITMENTS AND CONTINGENCIES - Operating Leases (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]      
Amended operating lease obligation, aggregate future minimum payments $ 757,000    
Amended operating lease obligation, aggregate future minimum payments due in 2019 699,000    
Amended operating lease obligation, aggregate future minimum payments due in 2020 58,000    
Rent expense under operating leases $ 703,000 $ 691,000 $ 708,000