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Reserve for Severance - Activity in Reserve (Details) - Employee Severance - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reserve for severance and related payments    
Balance at beginning of period $ 909 $ 359
Charged to earnings 2,077 1,756
Cash paid (1,735) (1,206)
Balance at end of the period $ 1,251 $ 909