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COMMITMENTS AND CONTINGENCIES - Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Leased Assets [Line Items]    
Operating lease, term of contract (in years) 10 years  
Rent expense $ 602 $ 593
Sublease rental income 343 $ 710
Future minimum lease commitments    
2021 506  
2022 434  
2023 422  
2024 314  
2025 278  
Thereafter 530  
Total $ 2,484  
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