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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Leases    
Operating lease, term of contract (in years) 10 years  
Rent expense $ 593 $ 569
Sublease rental income 710 $ 540
Future minimum lease commitments    
2020 604  
2021 548  
2022 476  
2023 425  
2024 314  
Thereafter 809  
Total $ 3,176  
Minimum    
Leases    
Sublease, term of contract (in years) 3 years  
Maximum    
Leases    
Sublease, term of contract (in years) 11 years