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5. Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of lease expense and sublease income
    Three months ended March 31,  
    2020     2019  
Operating lease expense   $ 177     $ 181  
Short term lease expense     14       41  
Variable lease expense     34       32  
Sub lease income     -       (17 )
Total lease cost   $ 225     $ 237  
Supplemental non-cash flow information related to right-of-use asset and lease liabilities

Supplemental non-cash flow information related to ROU asset and lease liabilities was as follows for the three months ended March 31, 2020 and March 31, 2019:

 

    Three months ended March 31  
    2020     2019  
 Accretion of the lease liability   $ 17     $ 40  
                 
Amortization of right-of-use assets   $ 160     $ 141  

 

As of March 31, 2020, our weighted average remaining lease term and discount rate were as follows:

 

Weighted Average Remaining Lease Term Operating Leases   1.5 years  
Weighted Average Discount Rate Operating Leases     14.8%  

 

Supplemental balance sheet information related to leases was as follows:

 

    As of
   

March 31,

2020

    

December 31,

2019

  
Operating lease right-of-use assets   $ 397     $ 557  
                 
Operating lease liability:                
Short term lease liability   $ 257     $ 377  
Long term lease liability   $ 158     $ 200  

 
Maturities of operating lease liabilities
Twelve months ended March 31,   Operating leases  
       
2021   $ 293  
2022     167  
Total lease payments   $ 460  
         
Less imputed interest     (45 )
         
Total operating lease liability   $ 415