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Unaudited Consolidated Statements of Changes in 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. 01, 2023 13,202      
Balance at Jan. 01, 2023 $ 13 $ 317,174 $ (305,292) $ 11,895
Issuance of common stock from private placement, net of stock issuance cost (in shares) 450      
Issuance of common stock from private placement, 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 0 0 0
Stock-based compensation 0 715 0 715
Net income (loss) 0 0 (1,228) (1,228)
Stock-based compensation $ 0 715 0 715
Balance (in shares) at Apr. 02, 2023 13,686      
Balance at Apr. 02, 2023 $ 14 320,181 (306,520) 13,675
Balance (in shares) at Jan. 01, 2023 13,202      
Balance at Jan. 01, 2023 $ 13 317,174 (305,292) 11,895
Net income (loss) [1]       (2,305)
Balance (in shares) at Oct. 01, 2023 13,906      
Balance at Oct. 01, 2023 $ 14 321,623 (307,597) 14,040
Balance (in shares) at Apr. 02, 2023 13,686      
Balance at Apr. 02, 2023 $ 14 320,181 (306,520) 13,675
Common stock issued under stock plans and employee stock purchase plans (in shares) 39      
Common stock issued under stock plans and employee stock purchase plans $ 0 122 0 122
Stock-based compensation 0 647 0 647
Net income (loss) 0 0 (2,269) (2,269)
Stock-based compensation $ 0 647 0 647
Balance (in shares) at Jul. 02, 2023 13,725      
Balance at Jul. 02, 2023 $ 14 320,950 (308,789) 12,175
Common stock issued under stock plans and employee stock purchase plans (in shares) 181      
Common stock issued under stock plans and employee stock purchase plans $ 0 0 0 0
Stock-based compensation 0 673 0 673
Net income (loss) 0 0 1,192 1,192
Stock-based compensation $ 0 673 0 673
Balance (in shares) at Oct. 01, 2023 13,906      
Balance at Oct. 01, 2023 $ 14 321,623 (307,597) 14,040
Balance (in shares) at Dec. 31, 2023 14,118      
Balance at Dec. 31, 2023 $ 14 322,436 (305,555) 16,895
Issuance of common stock from private placement, net of stock issuance cost (in shares) 223      
Issuance of common stock from private placement, net of stock issuance cost $ 0 3,535 0 3,535
Common stock issued under stock plans and employee stock purchase plans (in shares) 81      
Common stock issued under stock plans and employee stock purchase plans $ 0 0 0 0
Stock-based compensation 0 1,709 0 1,709
Net income (loss) 0 0 108 108
Stock-based compensation $ 0 1,709 0 1,709
Balance (in shares) at Mar. 31, 2024 14,422      
Balance at Mar. 31, 2024 $ 14 327,680 (305,447) 22,247
Balance (in shares) at Dec. 31, 2023 14,118      
Balance at Dec. 31, 2023 $ 14 322,436 (305,555) 16,895
Net income (loss)       (3,536)
Balance (in shares) at Sep. 29, 2024 14,697      
Balance at Sep. 29, 2024 $ 15 329,965 (309,091) 20,889
Balance (in shares) at Mar. 31, 2024 14,422      
Balance at Mar. 31, 2024 $ 14 327,680 (305,447) 22,247
Common stock issued under stock plans and employee stock purchase plans (in shares) 36      
Common stock issued under stock plans and employee stock purchase plans $ 0 188 0 188
Stock-based compensation 0 920 0 920
Net income (loss) 0 0 (1,550) (1,550)
Stock-based compensation $ 0 920 0 920
Balance (in shares) at Jun. 30, 2024 14,458      
Balance at Jun. 30, 2024 $ 14 328,788 (306,997) 21,805
Common stock issued under stock plans and employee stock purchase plans (in shares) 239      
Common stock issued under stock plans and employee stock purchase plans $ 1 0 0 1
Stock-based compensation 0 1,177 0 1,177
Net income (loss) 0 0 (2,094) (2,094)
Stock-based compensation $ 0 1,177 0 1,177
Balance (in shares) at Sep. 29, 2024 14,697      
Balance at Sep. 29, 2024 $ 15 $ 329,965 $ (309,091) $ 20,889
[1] As revised. Refer to Note 2 for further information.