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Leases - Future Maturities of Operating Lease Liabilities and Other Lease Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lease Liability      
2021 $ 115    
2022 83    
Total lease payments 198    
Less: interest (2)    
Present value of lease liabilities 196   $ 517
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases (cash payments) 58 $ 50  
Operating cash flows from operating leases (lease liability addition) 0 42  
Operating lease right-of-use assets obtained in exchange for leases entered into during the period $ 0 $ 195