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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Leases    
Operating lease, term of contract (in years) 10 years  
Rent expense $ 403 $ 276
Sublease rental income 272 $ 282
Future minimum lease commitments    
2019 158  
2020 549  
2021 487  
2022 412  
2023 357  
Thereafter 987  
Total $ 2,950  
Minimum    
Leases    
Sublease, term of contract (in years) 3 years  
Maximum    
Leases    
Sublease, term of contract (in years) 11 years