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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease expense $ 640 $ 380  
Operating lease expense     $ 380
Variable lease payment 289 250  
Variable lease payment     229
Total lease expense $ 929 $ 630 600
Total lease expense     $ 609