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Leases - Supplemental balance sheet information (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating Leases:    
Operating lease right-of-use asset $ 4,950 $ 6,042
Financial position us-gaap:OperatingLeaseRightOfUseAsset us-gaap:OperatingLeaseRightOfUseAsset
Operating lease liability - current $ 1,459 $ 1,256
Financial position us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityCurrent
Operating lease liability - noncurrent $ 4,500 $ 5,961
Financial position us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Total operating lease liabilities $ 5,959 $ 7,217
Financial position us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent