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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
Mar. 31, 2021
Dec. 31, 2020
Operating lease payments due:    
Within one year $ 1,557  
After one but within two years 2,061  
After two but within three years 1,815  
After three but within four years 1,760  
After four but within five years 1,373  
After five years 4,810  
Total undiscounted cash flows 13,376  
Discount on cash flows (1,548)  
Total lease liability 11,828 $ 11,200
Finance lease payments due:    
Within one year 163  
After one but within two years 217  
After two but within three years 217  
After three but within four years 252  
After four but within five years 259  
After five years 3,733  
Total undiscounted cash flows 4,841  
Discount on cash flows (1,395)  
Total lease liability $ 3,446 $ 3,467