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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities [Abstract]    
Salaries, employee benefits and related taxes $ 1,811 $ 1,716
Operating lease liabilities — current 297 370
Other 1,196 400
Total accrued liabilities $ 3,304 $ 2,486