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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued Liabilities    
Accrued payroll and related employee expenses $ 4,938 $ 3,954
Accrued employee performance bonus 4,873 3,920
Employer payroll tax, including social security deferral 3,034 368
Accrued rebates 1,178 1,573
Sales tax liability 1,696 1,907
Accrued interest 4,145 4,951
Operating and financing lease liability (current portion) 4,407 4,494
Other 3,878 3,568
Total accrued expenses $ 28,149 $ 24,735