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Leases - Summary of Maturity Analysis of Operating and Finance Lease Liabilities and Reconciliation of Undiscounted Cash Flows (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Operating lease payments due:    
Within one year $ 521  
After one but within two years 1,868  
After two but within three years 1,824  
After three but within four years 1,572  
After four but within five years 1,512  
After five years 5,584  
Total undiscounted cash flows 12,881  
Discount on cash flows (1,669)  
Total lease liability 11,212 $ 12,544
Finance lease payments due:    
Within one year 54  
After one but within two years 216  
After two but within three years 217  
After three but within four years 217  
After four but within five years 252  
After five years 3,992  
Total undiscounted cash flows 4,948  
Discount on cash flows (1,460)  
Total lease liability $ 3,488 $ 3,551