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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Payroll and incentive compensation $ 3,095 $ 1,366
Real estate taxes 334 341
Current portion of operating lease liabilities 142 179
Other 301 310
Total accrued expenses $ 3,872 $ 2,196