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6. Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Payroll and incentive compensation $ 2,092 $ 3,009
Real estate taxes 320 398
Current portion of operating lease liabilities 181 285
Other 297 395
Total accrued expenses $ 2,890 $ 4,087