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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases    
Operating lease, term of contract (in years) 10 years  
Rent expense $ 144 $ 131
Sublease rental income 85 $ 89
Future minimum lease commitments    
2020 474  
2021 548  
2022 476  
2023 425  
2024 314  
Thereafter 808  
Total $ 3,045  
Minimum    
Leases    
Sublease, term of contract (in years) 3 years  
Maximum    
Leases    
Sublease, term of contract (in years) 11 years