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Condensed 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. 02, 2021 11,094      
Balance at Jan. 02, 2021 $ 11 $ 306,885 $ (294,409) $ 12,487
Common stock issued under stock plans and employee stock purchase plans (in shares) 354      
Common stock issued under stock plans and employee stock purchase plans $ 0 (484) 0 (484)
Stock-based compensation 0 368 0 368
Net loss $ 0 0 (1,689) (1,689)
Balance (in shares) at Apr. 04, 2021 11,448      
Balance at Apr. 04, 2021 $ 11 306,769 (296,098) 10,682
Common stock issued under stock plans and employee stock purchase plans (in shares) 64      
Common stock issued under stock plans and employee stock purchase plans $ 1 146 0 147
Stock-based compensation 0 202 0 202
Net loss $ 0 0 (2,062) (2,062)
Balance (in shares) at Jul. 04, 2021 11,512      
Balance at Jul. 04, 2021 $ 12 307,117 (298,160) 8,969
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 0 0 0
Stock-based compensation 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. 02, 2022 11,863      
Balance at Jan. 02, 2022 $ 12 310,222 (301,025) 9,209
Net loss       (1,688)
Balance (in shares) at Jul. 03, 2022 12,428      
Balance at Jul. 03, 2022 $ 12 312,686 (302,713) 9,985
Balance (in shares) at Apr. 03, 2022 12,362      
Balance at Apr. 03, 2022 $ 12 312,087 (302,189) 9,910
Common stock issued under stock plans and employee stock purchase plans (in shares) 66      
Common stock issued under stock plans and employee stock purchase plans $ 0 122 0 122
Stock-based compensation 0 477 0 477
Net loss $ 0 0 (524) (524)
Balance (in shares) at Jul. 03, 2022 12,428      
Balance at Jul. 03, 2022 $ 12 $ 312,686 $ (302,713) $ 9,985