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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Leases    
Operating lease, term of contract (in years) 10 years  
Rent expense $ 131 $ 91
Sublease rental income 89 $ 92
Future minimum lease commitments    
2019 451  
2020 513  
2021 450  
2022 374  
2023 318  
Thereafter 969  
Operating Leases, Future Minimum Payments Due, Total $ 3,075  
Minimum    
Leases    
Sublease, term of contract (in years) 3 years  
Maximum    
Leases    
Sublease, term of contract (in years) 11 years