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Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Jan. 02, 2022 11,863      
Balance at Jan. 02, 2022 $ 12 $ 310,222 $ (301,025) $ 9,209
Issuance of common stock under public stock offering, net of stock issuance cost (in shares) 310      
Issuance of common stock under public stock offering, net of stock issuance cost $ 0 1,482 0 1,482
Common stock issued under stock plans and employee stock purchase plans (in shares) 189      
Common stock issued under stock plans and employee stock purchase plans $ 0 383 0 383
Net loss $ 0 0 (1,164) (1,164)
Balance (in shares) at Apr. 03, 2022 12,362      
Balance at Apr. 03, 2022 $ 12 312,087 (302,189) 9,910
Balance (in shares) at Jan. 01, 2023 13,202      
Balance at Jan. 01, 2023 $ 13 317,174 (305,292) 11,895
Issuance of common stock under public stock offering, net of stock issuance cost (in shares) 450      
Issuance of common stock under public stock offering, net of stock issuance cost $ 1 2,292 0 2,293
Common stock issued under stock plans and employee stock purchase plans (in shares) 34      
Common stock issued under stock plans and employee stock purchase plans $ 0 715 0 715
Net loss (1,228) (1,228)
Balance (in shares) at Apr. 02, 2023 13,686      
Balance at Apr. 02, 2023 $ 14 $ 320,181 $ (306,520) $ 13,675