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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. 03, 2021 11,094      
Balance at Jan. 03, 2021 $ 11 $ 306,885 $ (294,409) $ 12,487
Common stock issued under stock plans and employee stock purchase plans (in shares) 571      
Common stock issued under stock plans and employee stock purchase plans $ 0 (222) 0 (222)
Common stock offering, net of issuance costs of $45 thousand (in shares) 198      
Common stock offering, net of issuance costs of $45 thousand $ 1 1,033 0 1,034
Stock-based compensation 0 2,526 0 2,526
Net income (loss) $ 0 0 (6,616) (6,616)
Balance (in shares) at Jan. 02, 2022 11,863      
Balance at Jan. 02, 2022 $ 12 310,222 (301,025) 9,209
Common stock issued under stock plans and employee stock purchase plans (in shares) 542      
Common stock issued under stock plans and employee stock purchase plans $ 0 253 0 253
Common stock offering, net of issuance costs of $45 thousand (in shares) 797      
Common stock offering, net of issuance costs of $45 thousand $ 1 4,664 0 4,665
Stock-based compensation 0 2,035 0 2,035
Net income (loss) $ 0 0 (4,267) (4,267)
Balance (in shares) at Jan. 01, 2023 13,202      
Balance at Jan. 01, 2023 $ 13 317,174 (305,292) 11,895
Common stock issued under stock plans and employee stock purchase plans (in shares) 466      
Common stock issued under stock plans and employee stock purchase plans $ 1 199 0 200
Common stock offering, net of issuance costs of $45 thousand (in shares) 450      
Common stock offering, net of issuance costs of $45 thousand $ 0 2,293 0 2,293
Stock-based compensation 0 2,770 0 2,770
Net income (loss) $ 0 0 (263) (263)
Balance (in shares) at Dec. 31, 2023 14,118      
Balance at Dec. 31, 2023 $ 14 $ 322,436 $ (305,555) $ 16,895