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Leases - Supplemental balance sheet information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Operating Leases:    
Operating lease right-of-use asset $ 5,371 $ 4,950
Financial position Operating lease right-of-use asset Operating lease right-of-use asset
Operating lease liability - current $ 2,027 $ 1,459
Financial position Operating lease liability - current Operating lease liability - current
Operating lease liability - noncurrent $ 4,238 $ 4,500
Financial position Operating lease liability - noncurrent Operating lease liability - noncurrent
Present value of lease liabilities $ 6,265 $ 5,959
Financial position us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent