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LEASES - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
lease
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
lease
Sep. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]        
Operating lease, weighted average remaining lease term 9 years 4 months 24 days   9 years 4 months 24 days  
Operating lease, weighted average discount rate 3.33%   3.33%  
Operating lease, rent expense $ 200   $ 700  
Number of operating lease agreements signed, but had not yet commenced. | lease 1   1  
Finance lease, weighted average remaining lease term 11 years 4 months 9 days   11 years 4 months 9 days  
Finance lease, weighted average discount rate 3.37%   3.37%  
Financial lease not yet commenced | lease 0   0  
1365 New Scotland Road, Slingerlands, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating lease, rent expense $ 13 $ 13    
Monthly rent and common area maintenance expense     $ 4  
Rent and common area maintenance expense     37 $ 40
2 Rush Street, Schenectady, New York | Director        
Lessee, Lease, Description [Line Items]        
Operating lease, rent expense $ 25 $ 26    
Monthly rent and common area maintenance expense     8  
Rent and common area maintenance expense     $ 76 $ 80