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LEASES (Tables)
 3 Months Ended
Mar. 31, 2022
LEASES [Abstract]  
Net Operating Lease Expense

During the three months ended March 31, 2022 and 2021, the net operating lease expenses were as follows (in thousands):

   
Three months ended March 31,
  

  2022
     2021
  
Operating lease expense
  
$
186
    
$
151
  
Sublease income
    
(21
)
    
(21
)
Variable lease expense
    
3
      
9
  
Total lease expense
  
$
168
    
$
139
  
Operating Lease Right-of-use Assets and Liabilities

The tables below show the beginning balances of the operating ROU assets and lease liabilities as of January 1, 2022 and the ending balances as of March 31, 2022, including the changes during the period (in thousands).

   
Operating Lease
ROU Assets
  
Operating lease ROU assets at January 1, 2022
  
$
2,567
  
Amortization of operating lease ROU assets
    
(102
)
Write off of ROU asset due to lease termination
    
(1,372
)
Operating lease ROU assets at March 31, 2022
  
$
1,093
  

   
Operating Lease
Liabilities
  
Operating lease liabilities at January 1, 2022
  
$
2,723
  
Principal payments on operating lease liabilities
    
(103
)
Write off of operating lease liability due to lease termination
    
(1,453
)
Operating lease liabilities at March 31, 2022
    
1,167
  
Less non-current portion
    
1,018
  
Current portion at March 31, 2022
  
$
149
  
Maturities of Operating Lease Liabilities The maturities of the operating lease liabilities are as follows (in thousands):

   
As of
March 31,
  
2022
  
$
201
  
2023
    
270
  
2024
    
272
  
2025
    
274
  
2026
    
267
  
Thereafter
    
245
  
Total payments
    
1,529
  
Less imputed interest
    
(362
)
Total operating lease liabilities
  
$
1,167