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Commitments and Contingencies - Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating leases:    
Operating lease right-of-use assets $ 25,612 $ 11,002
Present value of net minimum lease payments (lease liability) 27,062 12,615
Finance leases:    
Finance lease right-of-use assets 365 379
Accumulated amortization (307) (170)
Finance lease right-of-use assets, net 58 209
Present value of net minimum lease payments (lease liability) $ 58 $ 212
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization