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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Leases    
Operating lease, term of contract (in years) 10 years  
Rent expense $ 264 $ 194
Sublease rental income 186 $ 188
Future minimum lease commitments    
2019 300  
2020 513  
2021 450  
2022 374  
2023 318  
Thereafter 969  
Total $ 2,924  
Minimum    
Leases    
Sublease, term of contract (in years) 3 years  
Maximum    
Leases    
Sublease, term of contract (in years) 11 years