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COMMITMENTS AND CONTINGENCIES - Lease payments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
COMMITMENTS AND CONTINGENCIES        
Rent expense $ 297 $ 299 $ 951 $ 948
Operating Leases        
2018 208   208  
2019 935   935  
2020 768   768  
2021 622   622  
2022 676   676  
Thereafter 4,118   4,118  
Total $ 7,327   $ 7,327