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Reserve for Severance - Activity in Reserve (Details) - Employee Severance - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reserve for severance and related payments    
Balance at beginning of period $ 1,251 $ 909
Charged to earnings 264 2,077
Cash paid (1,323) (1,735)
Balance at end of the period $ 192 $ 1,251