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Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating leases        
Operating lease expense $ 120 $ 180 $ 359 $ 540
Variable lease expense 5 61 139 182
Operating lease expense 125 241 498 722
Short-term lease rent expense 63 4 191 7
Total expense $ 188 $ 245 $ 689 $ 729