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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Commitments and Contingencies        
Operating lease expense $ 204 $ 201 $ 612 $ 561
Operating Lease Cost        
Short term lease expense 28 75 138 104
Variable lease expense 30 29 84 89
Total operating lease cost 262 305 834 754
Finance Lease Cost        
Amortization of right-of-use-assets 58 94 168 155
Interest on lease liabilities 20 26 61 44
Total finance lease cost $ 78 $ 120 $ 229 $ 199