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Leases Operating Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Lease expense $ 350 $ 327 $ 1,002 $ 968
Short-term leases 93 44 249 110
Sub-lease income 0 0 0 0
Lease cost $ 443 $ 371 $ 1,251 $ 1,078