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Commitments and Contingencies - Components of lease expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating lease costs:        
Operating lease rental expense $ 309 $ 277 $ 1,362 $ 950
Other income (305) (303) (881) (904)
Total operating lease costs 4 (26) 481 46
Finance lease costs:        
Amortization of right-of-use assets 2 2 6 7
Interest on lease liabilities       1
Total finance lease costs $ 2 $ 2 $ 6 $ 8