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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Commitments and Contingencies        
Operating lease expense $ 204 $ 183 $ 408 $ 360
Operating Lease Cost        
Short term lease expense 71 15 110 29
Variable lease expense 21 26 54 60
Total operating lease cost 296 224 572 449
Finance Lease Cost        
Amortization of right-of-use-assets 55 61 110 61
Interest on lease liabilities 20 18 41 18
Total finance lease cost $ 75 $ 79 $ 151 $ 79