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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Beginning balance at Dec. 31, 2017 $ 14,878 $ 80 $ 268,833 $ (254,035)
Beginning balance (in shares) at Dec. 31, 2017   80,536    
Common Stock issued under stock plans and employee stock purchase plan (47)   (47)  
Common Stock issued under stock plans and employee stock purchase plan, shares   91    
Stock-based compensation 432   432  
Net loss (3,970)     (3,970)
Ending balance at Apr. 01, 2018 11,293 $ 80 269,218 (258,005)
Ending balance (in shares) at Apr. 01, 2018   80,627    
Beginning balance at Dec. 30, 2018 17,255 $ 95 284,974 (267,814)
Beginning balance (in shares) at Dec. 30, 2018   95,513    
Common Stock issued under stock plans and employee stock purchase plan 740 $ 2 738  
Common Stock issued under stock plans and employee stock purchase plan, shares   1,676    
Stock-based compensation 951   951  
Net loss (3,476)     (3,476)
Ending balance at Mar. 31, 2019 $ 15,470 $ 97 $ 286,663 $ (271,290)
Ending balance (in shares) at Mar. 31, 2019   97,189