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6. Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Payroll and incentive compensation $ 1,707 $ 3,009
Current portion of operating lease liabilities 305 285
Real estate tax 273 398
Other 347 395
Total accrued expenses $ 2,632 $ 4,087