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Severance Reserve (Details) - Employee Severance - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reserve for severance and related payments    
Balance at beginning of period $ 192 $ 1,251
Charged to earnings 626 404
Cash paid (368) (340)
Balance at end of period $ 450 $ 1,315