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Commitments and Contingencies (Schedule of Amount, Timing and Uncertainty of Cash Flows from Operating Leases) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Maturity of Lease Liabilities    
Remaining of 2020 $ 5,367  
2021 7,304  
2022 7,488  
2023 7,704  
2024 7,920  
Thereafter 23,598  
Total undiscounted operating lease payments 59,381  
Less: imputed interest (14,511)  
Present value of operating lease liabilities 44,870  
Balance Sheet Classification    
Operating lease liabilities, current 3,967 $ 3,837
Operating lease liabilities, non-current 40,903 $ 41,964
Total operating lease liabilities $ 44,870