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Unaudited Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Apr. 03, 2022
Apr. 04, 2021
Total revenue $ 4,096 $ 2,240
Cost of revenue 1,635 1,096
Gross profit 2,461 1,144
Operating expenses:    
Research and development 1,333 1,887
Selling, general and administrative 2,137 1,947
Total operating expenses 3,470 3,834
Loss from operations (1,009) (2,690)
Interest expense (33) (32)
Gain on forgiveness of debt 0 1,192
Interest income and other income (expense), net (123) (7)
Loss before income taxes (1,165) (1,537)
(Benefit from) provision for income taxes (1) 152
Net loss $ (1,164) $ (1,689)
Net loss per share:    
Basic and diluted (in dollars per share) [1] $ (0.10) $ (0.15)
Weighted average shares outstanding:    
Basic and diluted (in shares) 12,126 11,264
[1] Net loss equals comprehensive loss for all periods presented.