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Accrued Liabilities and Other (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accrued vacation $ 803 $ 736
Accrued paid personal leave 360 399
Accrued bonus 1,699 1,658
Property tax payable 1,157 0
Other 306 512
Accrued liabilities and other $ 4,325 $ 3,305