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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 02, 2023
Apr. 03, 2022
Revenue $ 4,133 $ 4,096
Cost of revenue 1,743 1,635
Gross profit 2,390 2,461
Operating expenses:    
Research and development 1,629 1,333
Selling, general and administrative 1,861 2,137
Total operating expenses 3,490 3,470
Loss from operations (1,100) (1,009)
Interest expense (58) (33)
Interest income and other expense, net (63) (123)
Loss before income taxes (1,221) (1,165)
Provision for (benefit from) income tax 7 (1)
Net loss $ (1,228) $ (1,164)
Net loss per share:    
Basic and diluted (in dollars per share) [1] $ (0.09) $ (0.10)
Weighted average shares outstanding:    
Basic and diluted (in shares) 13,215 12,126
[1] Net loss equals comprehensive loss for all periods presented.