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Accrued Liabilities - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued Liabilities    
Accrued salaries and other compensation $ 773 $ 835
Sales and marketing programs 575 378
Product warranty 194 194
Current portion of operating lease liabilities 579 577
Accrued legal fees and costs 78 772
Other accrued liabilities 153 449
Total $ 2,352 $ 3,205