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Accrued Liabilities Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Schedule of Accrued Current Liabilities
Accrued current liabilities consisted of the following (in thousands):
At December 31,
20202019
Accrued legal and professional fees$149 $215 
Accrued payroll and related benefits885 360 
Accrued sales commissions95 32 
Accrued restructuring11 24 
Accrued warranty reserve227 195 
Accrued liabilities45 186 
Total accrued liabilities$1,412 $1,012