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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases        
Operating lease, term of contract (in years) 10 years   10 years  
Rent expense $ 144 $ 133 $ 288 $ 264
Sublease rental income 89 $ 97 182 $ 186
Future minimum lease commitments        
2020 296   296  
2021 505   505  
2022 435   435  
2023 422   422  
2024 314   314  
Thereafter 808   808  
Total $ 2,780   $ 2,780  
Minimum        
Leases        
Sublease, term of contract (in years)     3 years  
Maximum        
Leases        
Sublease, term of contract (in years)     11 years