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Accrued Liabilities - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued Liabilities    
Accrued salaries and other compensation $ 733 $ 773
Sales and marketing programs and customer credit balances 869 575
Product warranty 194 194
Current portion of operating lease liabilities 623 579
Accrued legal fees and costs 78
Other accrued liabilities 130 153
Total $ 2,549 $ 2,352