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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating Leased Assets [Line Items]        
Operating lease, term of contract (in years) 10 years   10 years  
Rent expense $ 140 $ 135 $ 436 $ 423
Sublease rental income 82 $ 90 263 $ 264
Future minimum lease commitments        
2021 124   124  
2022 490   490  
2023 481   481  
2024 371   371  
2025 335   335  
Thereafter 665   665  
Total $ 2,466   $ 2,466  
Minimum        
Operating Leased Assets [Line Items]        
Sublease, term of contract (in years)     3 years  
Maximum        
Operating Leased Assets [Line Items]        
Sublease, term of contract (in years)     11 years