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6. Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Payroll and incentive compensation $ 2,221 $ 3,009
Current portion of operating lease liabilities 190 285
Real estate taxes 354 398
Other 301 395
Total accrued expenses $ 3,066 $ 4,087